zoot suit

noun2

1. •
   An outfit featuring a suit with broad shoulders, a long coat, and baggy trousers that taper to a tight fit at the ankles.
2. •
   (UK, slang) Synonym of goon suit (“waterproof rubber suit for pilots”).

   • Before his nap, Kaplan had put on all his clothes, including the wool-lined waterproof double-zippered survival suit nicknamed the zoot suit. — 2019