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In my experience, it still absolutely depends on where you are interviewing. Here's some generally-applicable advice:

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  Err on the side of over-dressing. The worst reaction you'll get is a "Make sure not to wear that tie to work!" joke. Usually, no harm done for overdressing.


• If it's a technical position for a financial firm or similar, wear a suit or at a minimum a collared shirt, slacks, and tie.


• If it's a software company, I'd go slacks, collared shirt (long sleeve) and tie (or similar business casual for women). Everyone there is probably wearing jeans, but wearing jeans to an interview is still a mistake, I believe.

The answers here all seem to say "play it safe and wear the suit", but I'd like to offer some insight from my experience – from both sides of the table.

This advice applies only to technical (developer) interviews. This is probably bad advice for people in other—especially customer-facing—roles.

Like many things in life, the answer is "it depends." I've interviewed with and worked in both large corporate environments and small start-ups. While it's true that even in large, established companies, dress is becoming less formal, I still wouldn't show up in anything less than a shirt and tie. If I had the misfortune of interviewing with a very conservative institution (I'm looking at you, banks/finance), a suit is the only way to go.

The startup world is entirely different. I've walked in to an interview in nothing more than a button-down and cotton pants, and the first words out of the interviewer's mouth were, "oh – you didn't have to get all dressed up just for me." While this isn't necessarily a negative, many startups are looking for as much (if not more) of an attitude/cultural fit as a technical/skillset fit. Showing up in a stuffy suit to be interviewed by someone in a hoodie might actually work against you – even if subconsciously.

I've seen this first-hand at my current (startup) company. Like anyone else in a mid-market city, we're struggling to find talent, so we brought in a candidate who wasn't the strongest. He showed up in dress pants, shirt, and a jacket. While he didn't work out for other reasons (he really didn't have the technical chops nor the cultural fit we're looking for), the one thing that stood out to me was a comment made later: "his outfit felt like he was trying too hard."

This particular candidate wasn't going to get hired no matter what he wore to the interview, but "playing it safe" didn't help either. Clearly, we're not consciously making decisions based on interview attire (other than "didn't show up in a mankini") – that would be a downright silly hiring practice. However, had his objective technical skills been closer to the bubble, the "trying too hard" attitude might have kept the scales tipped in a "no" direction based on the purely subjective cultural fit criteria.

The bottom line here is you're interviewing for a position where there's often zero customer interaction and sometimes even extremely limited internal (inter-department) interaction. (Or none, for WFH gigs.) As long as you're getting the job done, how you present yourself doesn't really matter (within limits, obviously). The disheveled mess with a beard and glasses who can close 20 issues a day is much more valuable to me than the gentleman with impeccable taste who still doesn't really understand the difference between HTML and (shudder) PHP.

So do you show up in jeans and a t-shirt? Probably not, unless you know everyone else does, and that they'd be OK with it. A suit? Only if you know (or have reason to suspect) that not doing so would be a detriment. In most cases, there's a happy medium to find.

I posted this answer previously to a related question of Programmers.SE

Clearly, being underdressed is a big risk. If you show up to an interview where they expect you to be wearing a suit and you’re wearing jeans and a t-shirt, there is a big chance your interviewers won’t take you seriously and be irritated that you don’t take their job interview seriously. I personally have never been in such an interview.

On the other hand, despite what some of the other answers here say, there can be serious risks to overdressing too. It is simply not true that there is no harm to just wearing a suit to every interview. I have worked at companies where candidates who wear suits to interviews are presumed to not be a good “culture fit”. At these places, if you wear a tie or a suit to a interview, you are assumed to be a “suit”—someone who should perhaps be in sales or finance—or even a moron overdressing to hide your incompetence.

I had a discussion at lunch with some coworkers about interviews and attire.

ME: What would you think if an interview candidate came in wearing a suit and tie?

COWORKER 1: Who is this clown?

COWORKER 2: I would think “oh jeez, this is some kind of Enterprise Java Bean programmer”

COWORKER 1: Or I would think he IS an Enterprise Java Bean

ME: <spit-take>

These places are not mythical or marginal—they are major employers of software engineers like Google, Microsoft, and Apple:

People sometimes wonder how they should dress. The most important thing is that you feel comfortable. If you still want a recommendation, I say a button-down shirt or even a T-shirt. A suit can come off as too formal in some companies (e.g. Google).

This point is not as important, because people won't really care. You should ask your recruiter about what to wear, since this differs by country and East Coast / West Coast. A company like Google is more casual, so if you come in a three-piece suit, your interviewers may raise an eyebrow. If you've got the goods in terms of engineering skills, it's not a dealbreaker though. One candidate came to an interview wearing a gothic mesh shirt with holes through which his nipples were clearly visible. He still got the job. (I don't recommend taking this risk.)

— Preparing For a Software Engineering Interview, by Niniane Wang, June 2006

No tie, unless you're in sales or marketing. I've worked at Apple, Microsoft and Adobe, nobody wears ties to interviews for tech positions.

— Comment on Ask MetaFilter

The only technical interview where I've ever felt inapprpropriately dressed was the time I wore a suit to interview at google. [rolls eyes at self] The people interviewing me, with whom I was hoping to become peers, were all wearing jeans and tee shirts. I felt like a complete idiot, was uncomfortable all day (for the standard 8-hour google marathon interview), and I didn't get the job.

— From this related question on Stack Overflow

I have worked in companies where people may have missed out on job offers because they came to the interview in a suit. People would say they're not a good "cultural fit.

— From a comment on the Joel on Software forums

You absolutely MUST do due diligence and find out what level of sartorial formality is expected from interview candidates. This means doing the following in this order and stopping when you get an answer: (1) researching on the company's careers or jobs site for hints—Google, for example, explicitly tells interview candidates “business casual is fine”; (2) asking friends or acquaintances you know who work at the company; and as a last resort (3) ask the HR rep or recruiter who set up the interview. Ask something along the lines of “I’ve worked in office environments with very different formality levels. How formal would you say it is at your company” or “What do successful candidates tend to wear to interviews?” There is some risk that the interviewer will be turned off that you wouldn’t know what to wear to an interview, but I think in most cases you can avoid that kind of situation through prior due diligence; i.e. step (1) or (2).

For what it's worth, my last two jobs have been for startups in Silicon Valley and I wore jeans to my interviews with a button-down shirt and casual loafers.

As a motorcyclist, for almost all of the interviews I have attended in the last 10 years I have worn a collared shirt and either smart black jeans or black leather trousers, and have never suffered for it.

In the early days of my career I would take a suit with me, arrive early and change when I got there. Usually though, arriving early just seemed to annoy interviewers.

Later I started arriving on time and asking the interviewer if they would like me to change, the theory being that they would understand the impracticality of riding a motorcycle in a suit, yet still appreciate me going to the effort. I never once had an interviewer say yes.

Since then I've taken the attitude that if smart casual isn't good enough, then I probably wouldn't fit in very well anyway, and this has served me well.

Also, if like me you do not feel comfortable in a suit, the value of fitting in might be outweighed by the adverse effects of wearing the suit on your interview performance. For me, just wearing a tie can put me ill at ease. Even so, if I turn up to interview and everyone is wearing a tie, I might excuse myself for a moment and don the tie I brought with me, just in case.

Ultimately, if you look businesslike and feel confident, it probably doesn't matter for a technical job, unless you are trying to get into a very formal/conservative environment.

It depends on the situation and anyone that tells you otherwise is likely over generalizing the industry.

On one extreme you are going to run into companies that will promptly tell you to go home if you are under dressed, but these are rare and the average person is not going to run into just as a matter of course. On the other hand you are going to run into companies that will give you an immediate down vote just for wearing a suit to an interview with them; however, my own experience here is that you are more likely to encounter a personal bias from the interviewer as opposed a full blown company culture against suits.

In general practice you are going to be best served by ensuring that you appear to have put thought into appearance that day, if only as recognition of the situation and as a courtesy to others. Baring extremes on one end of the spectrum or the other, you are unlikely going to have a negative reaction if you are wearing a well fitted suit to the interview, although if the suit fits poorly (i.e. the suit is wearing you as opposed to the other way around) it can reflect negatively.

Generally when I go in for an interview I've always worn a suit or slacks and a sport coat and the only exception thus far being when I interviewed with a start-up and found out they were biased against suits before hand and "dressed down" by wearing slacks and a dress shirt.

Don't forget that when interviewing you are also interviewing the company as well though and the appearance of the people interviewing you also says something. Personally I find it a touch disrespectful to be interviewed by someone wearing shorts and a pair of saddles and one should expect the people interviewing you to dress a touch better than they normally would as a matter of courtesy and respect as well.

I generally just directly ask the person I'm going to be interviewing with, or the person setting up the interview (who is sometimes, but not always, the same person). I don't see much point in trying to guess or find out indirectly.

You asked for exact language, but I don't think it matters much. In one case, I asked (by e-mail) "What should I wear (suit and tie, casual)?" In another case, I was a bit more informal because I was asking a friend who works there: "I'm guessing (and hoping) that this is casual dress (I had to wear a full suit and tie for an interview today)." (In both cases, the answer was business casual.)

There's enough uncertainty about proper clothing for technical interviews that coming out and asking shouldn't make a bad impression.

Once or twice I've worn a suit and tie to an interview and been asked why I was dressed so formally; in one case the person interviewing me said he didn't own a suit himself.

EDIT :

If there's a good reason not to just ask the interviewer what to wear, I'd be interested in seeing it.

From the perspective of a developer who's not good enough to work for ultra cool, cutting edge Silicon Valley companies, I would say bite the bullet and wear that stupid suit.

I look forward to the day when wearing a suit to an interview is seen as silly, but the fact of the matter is there may still be some old fashioned hiring managers out there who think you should dress to impress, and might feel miffed if you show up in just a polo and khakis.

Wearing a suit will never cause a manager to not hire you, but, unfortunately showing up dressed too casually may.

Like it or not. If you don't dress up for the interview, even in a casual dress workplace environment, the interviewer may think that you don't consider their position worthy of making an effort to look extra nice.

It may also lead them to conclude that if the interview isn't worth your putting in a little extra effort then there will be plenty of tasks that the job requires from you that you would consider not worth your extra effort also.

In other words, you risk creating an immediate negative first impression by not demonstrating that this interview is important enough to you that it makes you want to put in the extra effort to look nice.

While I don't consider any of the places I have worked at (in 20+ years) as stuffy and all have been casual dress, I can't recall anyone that was hired who didn't show up for the interview in a suit or business dress (for women). I can recall several decent candidates who dressed casual but were turned down for various reasons which may have been amplified in their importance because of the negative first impression by not putting in such a simple extra effort as dressing up.

Realistically (by which I mean cynically), it works something like this:

• There's a reasonable body of thought in pop psychology that people judge each other almost instantly. If this is true then job interviews are mostly pointless, you could just as well show up, shake hands, and they could make an offer or not. However, it's probably not as false as people might think who put a lot of time, energy, and technique into hiring. Often that time isn't going into deciding whether you're suitable, it's spent trying to rank the suitable candidates because they only have one place to fill. Your clothing isn't going to directly enter into this fine comparison, only the coarse one.


• Some people genuinely don't care what anyone wears as long as it covers key areas of the anatomy. Such employers are irrelevant to this discussion because it's very difficult to dress wrong for them. They're of passing interest, though, because if you are unbothered what you wear then at least you have something in common with them.


• Many people claim to judge you primarily on your skills (and, to be precise, aptitudes, knowledge, experience, approaches to problem-solving), especially for technical posts.


• Many (perhaps most) people actually judge each other on their clothes all the time. Some of those have the decency to wish they didn't, but they find themselves doing it anyway.


• The intersection of the previous two groups is far from empty, which means there's a significant body of employers who claim (and perhaps think) they assess on skills, but actually use skills as a tie-breaker between people who look the part.


• Some people feel uncomfortable in suits, but take this too far and genuinely cannot comprehend that the same is not true of everyone. Therefore, to them, a person in a suit who is not attending a wedding is some brand of charlatan. They are fools, but they're also clever and senior in some software companies, so they're extremely high-functioning fools. They also literally cannot comprehend that a person who chooses to wear a suit to an interview (or in general to meet clients or other business-related strangers), might wear jeans to work on a regular basis if that turns out to be the done thing. They do not have much versatility of dress, and they fear and distrust people to whom a single universal style of dress just isn't so important.


• Some people feel scruffy when not in suits, but take this too far and genuinely cannot ... [similar stuff to the above] ... fear and distrust people to whom a single universal style of dress just isn't so important.


• Both of the above groups spend a lot of time talking about "company culture" and "whether people fit in", when actually they're just looking at whether you look the same as them the first time they meet you and laugh at their jokes. This is code, it means "we fear diversity, and it's only by pure dumb luck or the advice of our lawyers that we're not discriminating on a protected characteristic". If you're reasonably happy to get along with anyone, then on the one hand you can probably chameleon your way in, but on the other hand you might come to think of them as conformist and insular. But if you can get along with anyone, you can get along with insular conformists, so that might be OK.


• When people do judge you, they judge you by their own standards. It used to be that you could buy a book of etiquette that just straight told you what to wear to every conceivable occasion, and everyone of the social classes it covered worked from the same book. This is no longer the case. Everyone makes it up as they go along but many are afflicted by a delusion that their personal or corporate preference is "just common sense".


• There is no single form of attire that is acceptable in all interview situations. Therefore, if you want to hit the right tone you must research or ask. There's no point looking for a silver bullet because there isn't one.

If you don't want to ask them directly about interview attire (and asking is a risk, because of it being "common sense"), then look into what people from the company wear to meet clients. This is their idea of "smart for strangers", and in most posts there's some chance they'll stick you in front of a client occasionally and they'll want to know you'll look alright. So they probably won't hold it against you. But if there's a big difference between what their salesfolk wear to meet clients and what their developers wear to meet clients then get yourself the right side of that gap.

Just like your resume, your attire should follow the company's culture. But I've always played it safe. And it's worked so far :)

If you are interviewing for big companies that are fairly known as formal (IBM, Microsoft, etc.), wear a suit.

Everyone else (small or laid-back companies)? Just lose the tie and the suit jacket. Keep the shoes, the pants and the shirt. You still look very professional, just a little less formal than suit.

When I first enterd the work world, suits were required for interviewing as they were required for daily dress. But times have changed and the workplace is much more informal. Software professionals in particular wear jeans to work every day at most workplaces. I don't even own a suit anymore.

For an interview, you are trying to make a good impression. Ask the person who sets up the interview what the company dress standard is if you feel unsure of what to wear. Then dress one notch above that. So if they all come to work in jeans, wear slacks and a nice shirt if you are male and a dress pants or a skirt with a nice top if you are a woman.

Women have some special issues associated with interviewing. This is not the place to wear very short miniskirts or any attire that shows your bra straps or cleavage or belly button. Keep sexy for outside the office. Do not wear killer high heels. You want to be taken seriously as a professional not as a potential date.

Whatever you wear, make it neat and tidy and clean.

No matter how informal the office is, leave off the t-shirts with the funny sayings or the obnoxious or political messages. Even if you choose to come in jeans, wear a nice shirt.

While you could ask, another way to resolve this is to go do a little reconnaissance of gathering the information by watching the place when people show up for work there assuming it isn't a massive place where it may be hard to figure out who are the developers in that place.

If I did have to ask someone at the place, I'd likely phrase it, "Hi, I'm coming in for an interview and wondered if there was a dress code I am to follow."

The key in using that kind of wording is that I'm just asking the question in a direct manner without a lot of fluff or build up. If necessary I would disclose my name and the interview details but I don't see these as important initially to note.

Err on the side of "overdressing." There are more than a few companies where casual dress is not acceptable, especially in the financial industry. Scott Adams has an interesting anecdote about one interview where he dressed like a college student:

When I was twenty, I was escorted out of an office building because of my choice of clothes. It happened at one of the top accounting firms in the country, and I was there for an interview during my last semester of college. I was so naïve that I didn't realize anyone would have a problem with me showing up with my long hair and casual clothes, college style. After all, it was no secret I was in college. It said so right on my resume. My interviewer sat down at the conference table, looked at me, and said, "Apparently you don't know why you're here. Let me show you the door." And he did.

One bank I worked at would send people home who were wearing sneakers and/or jeans. I have odd shaped feet that make acquiring "dress shoes" a multi-week process (it is possible for me to enter a shoe store, try on every shoe in the store and find none that fit comfortably), so I had to find sneakers that were monochromatic enough to pass for dress shoes. When I do find dress shoes that fit, I now acquire enough spares to last about 20 years of normal use.

In an interview, you only have a few seconds to make a first impression, and it is very hard to get over a bad beginning. My advice for reducing the risks of that part of the interview is to dress conservatively and well. One of the questions that folks interviewing IT workers is along the lines of "can we let this person out where the customers might see them?"

Plenty of the answers here cover you should consider the job and cultures of the potential employers and that suits aren't required but more so the "safe" answer.

It's also worth noting you should consider your ambitions and your background when choosing your attire.

If I'm taking a job as a junior dev, but my ambition is to be a Project Manager, I should dress the part. I also should act in a manner appropriate to someone hoping to be a PM. (Dress to the job you want, not the job you have, perception is a powerful thing)

It's also worth considering your background. I use to sit on a board of directors and a few roles where a nice suit was an unspoken must. If you're moving from a role that had a higher expectation of dress code to a role that's a bit more lax you should probably over dress a bit. It's a perception thing, probably one that isn't really fair, but due to my background sometimes people expect me to be a notch more formal and professional than those in my same role.

My experience has been if you were a leader, or have ambitions to be one. You want people to think of you as someone who can lead before they are looking. (that way when your boss retires you're the natural choice to fill in their shoes)

Rarely is a tech company just a technical company. Most tech companies focus on a particular industry and will follow those standards. Finance and legal, for instance, are still very strict. Marketing and healthcare are a bit more relaxed.

One good way to determine the appropriate interview wear is to ask if there's a company dress code, or a dress code for your position. Technical consultants, for instance, may be required to wear a suit, so if you're interviewing for that position, prove that you can wear a suit.

If the recruiter tells you that there is no dress code or that the dress code is very relaxed, take a look at the industry. A technology company that focuses on marketing and advertising or considers itself 'disruptive' might want someone to signal that they are 'fashion forward' with their interview outfit. For men this could mean suit pants and a button down shirt with contemporary pattern on it. For women, classy separates or modest dresses, preferably with an item or two in a 'bold' color or pattern.

Interviewees who want to signal that they are reliable may want to stick to 'middle-management wear': khaki pants, button downs or polo shirts, pullover sweaters if it's cold, knee-length skirts and dresses, dress shoes with reasonable heels.

I recently attended a technical interview where I wore a dark green patterned dress that was fashion-forward yet modest, dark tights, gray lace-up heels, and a black open cardigan. A friend of mine attended an interview for a creative position in a teal blazer, with button down top and black trousers. We were both offered positions.

When in doubt, the dress code of your local catholic high school is often a good guide: http://www.ignatius.org/media/2648/dress-and-appearance-standards-2016-17.pdf If you're looking to come off as 'bleeding edge', break or bend a couple of these rules while adhering to the rest.

At minimum, your cloths should fit well, be clean, free of holes or rips, sufficiently modest for your industry, and look new.

Personally I would wear if you have it a suit and a patterned shirt no tie.

If you don't own a suit you may want to consider nice slacks, a plain shirt(blue always feels safe to me), and a tie.

I have applied for various IT roles in a government office or a bank/large company the suit and no tie has seemed about correct.

Applying for a technical job in a smaller company or out of something like "best buy" I would just go slacks and a shirt and a tie.