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Your appearance is the first thing that the interviewer will notice about you, and they will likely form opinions about you based on the way you look and present yourself.  This includes not only your dress, but the way you carry yourself as well.  Dress professionally and neatly to show the employer that you are serious about the job.  Men should wear pressed collared dress shirts, dress slacks, tie, and polished dress shoes.  Women should wear a nice blouse, slacks or skirt and dress shoes.  Your shoe choice should reflect the job that you are applying for.  If you are interviewing at a high-end fashion or lingerie store, high heels would be appropriate for a woman.  If you are applying to a hardware or department store, a nice pair of flats would be appropriate. Remember that the interview process is a two way street. You should be evaluating if the company is a good fit for you as well. Asking questions also shows the interviewer that you are serious about working at the company. Questions you may want to ask include: "How many hours a week am I expected to work?" "Will I be required to work nights and/or weekends?" "How are employees reviewed and evaluated?" "What would a typical day be like in this position?" Following up is the last step of the interview process.  You should send a follow up letter within 24 hours.  Make sure that you send the follow up letter during business hours Most interviewers prefer an email, but you can send a handwritten thank you note as well.  Make sure you proofread the letter before you send it.  You are being evaluated every time you communicate with the interviewer. Your letter should thank the interviewer for their time, mention something that was discussed during the interview, and reiterate why you are a good fit for the position.
Dress appropriately. Prepare questions to ask your potential employer. Follow-up after the interview.