A tuxedo, or dinner suit, is a formal suit with satin or grosgrain accents on the jacket's lapels, buttons, and trouser seams. Typically black or midnight blue, it's worn with a formal shirt, tie or bow tie, and leather shoes. The jacket may be single or double-breasted, often paired with a waistcoat or cummerbund, a white pocket square, and cufflinks. It's a classic choice for black-tie events.