A traditional suit is preferred to a blazer. The color should be either a dark blue or grey in either a solid or invisible plaid with a pressed white long-sleeved dress shirt. Make sure your tie, when knotted, comes to the middle of your belt buckle. Its width should be harmonious to the suit lapel and silk is the best fabric.
Skirted suit is almost always preferable.
A solid navy, gray, or black suit with a solid or lighter-colored blouse is recommended for most positions. Avoid brown, green or pastel suits. Business dresses are acceptable in fields that are less formal and less conservative. Use only a neutral color or clear nail polish, if any. Hair Clean, well-groomed, and professional looking.