Business casual
Business casual for men — Collar, real trousers, leather shoes. Everything else is negotiable.
Business casual for women — Polished, covered, comfortable for nine hours. Here is how to hit all three.
Cocktail attire
Cocktail attire for men — A dark suit, a real shirt, leather shoes. The tie is the only open question.
Semi-formal
Semi-formal attire for women — Dressier than a work outfit, simpler than a gown. Midi length is the safe bet.