leisure suit definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a man's suit, designed for casual wear, having the jacket styled like a shirt, typically with a button front, and usually worn without a necktie
leisure suit definition by American Heritage Dictionary
A man's suit for informal wear, consisting of a shirtlike jacket and matching slacks.