jumpsuit

or jump suit

[juhmp-soot]
noun
  1. a one-piece suit worn by parachutists for jumping.
  2. a garment fashioned after this, usually combining a shirt or bodice with shorts or trousers in one piece.

Origin of jumpsuit

First recorded in 1940–45; jump + suit
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for jump suit

jump suit

noun
  1. a one-piece garment of combined trousers and jacket or shirt
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