Definition of zoot suit noun from the Oxford Advanced Learner's Dictionary

 

zoot suit

 noun
noun
BrE BrE//ˈzuːt suːt//
 
, also BrE//ˈzuːt sjuːt//
 
; NAmE NAmE//ˈzuːt suːt//
 
 
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a man’s suit with wide trousers/pants and a long loose jacket with wide shoulders that was popular in the 1940s Word Origin 1940s: rhyming formation on suit.
See the Oxford Advanced American Dictionary entry: zoot suit