jump suit

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A parachutist's uniform.
• noun A one-piece garment consisting of a blouse or shirt with attached slacks or shorts.

from the GNU version of the Collaborative International Dictionary of English.

• noun a one-piece coverall used by parachutists while jumping from an airplane.
• noun a one-piece garment resembling a jumpsuit{1}, having a shirt or blouse attached to trousers or shorts.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun one-piece uniform worn by parachutists
• noun one-piece garment fashioned after a parachutist's uniform