Use minimal cologne or perfume, and allow absolutely no visible body piercing. Empty your pockets so as to rid bulges or jingling coins. Do not chew gum, eat candy, or smoke cigarettes at the interview. Carry only a light briefcase or a portfolio case. Black is the popular choice.
Beards are a minus, while mustaches, though unfitting can get by if neat and trimmed.
Do not wear rings other than a wedding or class ring, and do not wear earrings. If you normally wear one, take them out. Avoid wearing dresses. Do not wear high heels. Put on conservative hosiery at or near skin color and always check for runs.