a tuxedo or full-dress suit.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use monkey suit in a sentence
Mrs. Gooch had only to thrust her hand into the little pocket of his monkey suit to convict him on the spot.Chantry House | Charlotte M. Yonge
At that it's better'n being a man in a monkey suit, with nothing to do but impress the passengers and order around the crew.Stand by for Mars! | Carey Rockwell
British Dictionary definitions for monkey suit
US slang a man's evening dress
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012