Dress in a manner that is professionally appropriate to the position for which you are applying. In almost all cases, this means wearing a suit. It is rarely appropriate to “dress down” for an interview, regardless of company dress code policy. When in doubt, go conservative.
You should wear a suit to interviews. “Suit” means the works: a matching jacket and pants, dress shirt, tie, coordinating socks and dress shoes. A dark-colored suit with light colored shirt is your best option.
Your suit should be comfortable and fit you well so that you look and act your best. There is a difference between not yet feeling at ease in a suit and trying to fit into the same suit you wore to your sister’s wedding when you were 15. (In the latter case, it’s time to invest in a new suit!)
Clothing should be neat, clean, and pressed. If you don’t have an iron, either buy one or be prepared to visit the dry-cleaner’s often. Shower or bathe the morning of the interview. Wear deodorant. Don’t wear cologne or aftershave. You don’t want to smell overpowering or worse, cause an allergic reaction.
Make sure you have fresh breath. Brush your teeth before you leave for the interview, and don’t eat before the interview. Don’t smoke right before an interview. Your hair should be neat, clean, and conservative.
Women generally should wear a suit with a skirt or pants. When in doubt, be more conservative.Your suit should be comfortable and fit you well; if your waistband is cutting you in half or your jacket is too tight, you won’t look or act your best. Some stores offer free alterations when you purchase a suit, or you may want to find a tailor to adjust a suit you already own.
Interview suits should be simple and dark in color. Anything tight, bright, short, or sheer should absolutely be avoided. (Interviewers have been known to complain about the length of interviewees’ skirts; if you have any doubts, it’s probably too short.) Knee-length skirts are suggested. Very long skirts, while modest, are also considered too trendy for an interview.
Shoes should be conservative and fairly low-heeled. They should be in reasonably good condition, not scuffed or run-down at the heels. Don’t wear shoes with an open toe or back; any shoes you would wear on a date or to a club are probably inappropriate. A basic pump is flattering, versatile, and will stay in style forever (once you own pumps, you can spend the rest of your money on fun shoes). The salesperson in the shoe store can steer you in the right direction.