Although many corporate cultures support business casual attire, it is always wise to wear a suit to an interview. The definition itself of “Business Casual” varies from business to business, and until you are part of a particular culture long enough to see what is acceptable, you might risk making an unfavorable impression by dressing too casual; however, depending on your particular situation, a suit may be “over-kill” and considered inappropriate.
But before you opt not to wear a suit, you should consider the following: Does the position, industry, location, and culture of the company warrant wearing a suit, or does it call for a more casual approach? You should also consider how you wish to be perceived. In most situations, a suit helps establish trust and credibility. When a more casual look can lessen the impact of your qualifications, suits are more appropriate.
Should an interviewer tell you not to wear a suit, it is best to ask what he or she considers appropriate. Whatever the response, you should always dress one-notch above the individual’s recommendations.