Wear a suit if you own one (both men and women). If you do not have a suit, wear professional pants (no jeans or short skirts) and an ironed shirt or blouse. Dresses on woman are acceptable, but make sure not to show too much leg, back or chest.
Comb your hair and shave.
Avoid heavy doses of cologne and perfume, as some individuals are allergic to these scents.
Wear dress shoes.
Keep your clothing neutral in color. You can add a splash of color on a tie, necklace, cufflinks, or small item.