Ask your prospective employers' office whether the company has a dress code. If so, then dress accordingly. If there is no dress code, then dress in a well-ironed shirt and matching trousers if you are a man. If you are a woman, be sure to wear business-looking attire. Polish your shoes the night before the interview. If you are wearing a tie, use a subtle color that is not flashy or in too much contrast with your clothes. A woman applicant should avoid flashy colors or a style that calls too much attention to itself.
Your certificates should be arranged neatly in a folder, which should not look worn or torn. Make certain you have showered before you go out the door. Male applicants' beards should look well-tended.
Avoid perfume and cologne at all costs. Many people are offended by obvious scents; some are allergic to them