The first impression you make is the most critical. Remember, you are marketing a product (yourself) to a potential employer, and the first thing the employer sees is your appearance and attire. Thus, it is always essential to dress professionally for a job interview, even if the work environment is casual. Dressing proper will give you a competitive edge and a positive first impression.
Should you be judged by what you wear? Perhaps not, but the reality is that you are judged. Throughout the entire job-seeking process employers use short cuts, heuristics or rules of thumb, to save time. With cover letters and resumes, it is the opening paragraph, a quick scan of your qualifications and accomplishments. With the job interview, it is how you are dressed that sets the tone of the interview.
Dressing conservatively is always the safest route, but you should try to investigate on your prospective employer to understand what best to wear. It does make sense to dress your best for the interview, regardless of the dress code at the organization. It is vital to dress to fit in with the organization. If you over dress or under dress the potential employer may feel that you do not care enough about the job. However, it is always better to be overdressed than underdressed.
Here's a quick look at the basics:
Women's Interview Attire
Men's Interview Attire
Avoid dressing in:
Do NOT Bring:
Other important facts:
Alison Doyle, About.com, Dressing for Success: How to Dress for an Interview.
Alison Doyle, About.com, What Not to Wear on an Interview
Debasmita Chanda, Oneindia.com, How to dress for an interview?
Randall S. Hansen, Ph.D., Quintessential Careers, When Job-Hunting: Dress for Success