From Longman Dictionary of Contemporary Englishsweat suitˈsweat suit, sweatsuit /ˈswetsuːt, -sjuːt $ -suːt/ noun [countable] American English DCCDSa set of loose warm clothes, worn especially for sport or relaxation
Examples from the Corpus
sweat suit• If the ease and comfort of a sweat suit could be transformed into a business suit, then Klein has done it. 