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

  • noun A one-piece undergarment combining shirt and long pants.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun one-piece underwear, usually long, combining drawers and long-sleeved, button-front undershirt in a single garment, with a flap in the seat that can be opened for defecation.

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

  • noun an undergarment with shirt and drawers in one piece


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  • A union suit is a type of one-piece long underwear. It originated as women's wear during the nineteenth-century United States clothing reform efforts, as an alternative to constricting garments, and soon gained popularity among men as well. The first union suit was patented in 1868. Traditionally made of red flannel with long arms and long legs, it buttoned up the front and had a button-up flap in the rear covering the buttocks (colloquially known as the "access hatch", "drop seat", "fireman's flap", and other names), allowing the wearer to eliminate bodily waste without removing the garment. Depending on the size, some union suits can have a dozen buttons on the front to be fastened through buttonholes from the neck down to the groin area.


    February 3, 2008