three-piece

adjective

1. Clothing. consisting of three matching or harmonious pieces, as an ensemble of coat, skirt, and blouse for a woman or a suit of a jacket, vest, and pair of trousers for a man.
2. having three parts.

noun

3. a three-piece ensemble or suit.Compare coordinate(def 7).

adjective

1. having three pieces, esp (of a suit, suite, etc) consisting of three matching parts

noun

2. a three-piece suite, suit, etc