1. (of clothing) made in or consisting of three parts or pieces; - Example: "the standard three-piece business suit jacket and trousers and vest";
WordNet (r) 3.0 (2006):
three-piece
adj 1: (of clothing) made in or consisting of three parts or
pieces; "the standard three-piece business suit; jacket
and trousers and vest" [ant: one-piece, two-piece]