For Men. For any first meeting, business presentation, and job interview: Full suit with matching jacket and pants with black belt. Pressed, collared shirt with plain (solid, stripe, or simple pattern) tie. Dark leather dress shoes and dark dress socks.
Business formal includes a dark pants suit, dark suit and tie, a black suit with a light button-down shirt, skirt suit or suit dress. In some cases, a long evening dress may be appropriate. Shoe options include formal flats, heels, Oxfords or loafers.
Do you need a blazer for business formal?
Your skirt should generally be around knee-length. If you choose to wear slacks, opt for a matching blazer and/or blouse. Those who want to wear pants should choose slacks that are an exact match to their suit jacket. Have your pants professionally pressed to ensure there is a fresh crease down the front of each leg.
Business Casual
Casual business attire is pretty ambiguous, but generally means slacks, khakis, or a skirt with a dress shirt, blouse or polo. Dresses and seasonal sport coats fall into this dress code as well.