For early evening weddings that begin around 6 p.m., guests should dress as if they are going to dinner or the theater, such as a cocktail dress for women and a suit for men. Dark colors work best, and black is fine to wear during evening weddings.
For early evening weddings, women can also wear a cocktail or dressy suit. In some cases, the invitation will direct guests on what to wear. If the wedding invitation says casual or semi-formal, men can wear slacks and a blazer rather than a formal suit. If the invitation says black tie optional, women can wear a cocktail or floor-length dress and men can wear a tuxedo or dark suit. If it is a black tie wedding men should wear a tuxedo and women should wear a floor-length gown with formal accessories, such as jewelry.