Before Your Interview, Wear something that is job interview appropriate

• Make sure there is no confusion about where you are supposed to go for the interview. If necessary, get a map or make a practice run to the place so you know how long it will take to get there.
• Research the company. You should know exactly what they do before you go in.
  Make a list of common job interview questions and figure out how you can best answer each one.
• Make a list of questions to ask the company. You can ask about the company itself, the company's customers, the position, and the people you will be working with.
• Practice your job interview with a friend or family member. Ask them to critique your answers afterwards.
• Record your practice interview sessions with a video camera so you can critique yourself later on. Pay special attention to your posture and body language.
• Determine your availability. The interviewer may ask you when you can start the job.
• Determine your bottom line. Will you accept the job if the pay is low? What about benefits? Interviewers often ask how much you expect to make.
• Be prepared to be tested during or after the job interview. Nowadays, many companies do drug testing. It's probably a good idea to clean out your system if you can't pass naturally.
• Wear something that fits you well, looks nice on you and is job interview appropriate. No short skirts, t-shirts, flip-flops or other casual clothing. Unless you wear a tux or an evening gown, you can't be overdressed.
• Use the restroom before you go. There's no telling how long the interview may last.
• Don't douse yourself in perfume or cologne. Some people have sensitive noses. A shower and deodorant is sufficient.
• Don't wear fur or jewelry that might be offensive to someone else.
• Don't smoke in the car on the way or on the interview premises. Again, some people have sensitive noses.
• Make sure your breath is fresh. Dragon breath never makes a good impression.
• Spit your gum out before you go into the building. It is harder to talk and smile with gum in your mouth.
• Show up at least 10 minutes early--15 minutes is even better.