Union Suit - Red Long Johns Well dressed men, Union suit, Mens attire

Undershirts: The Man's Guide to Their History, Styles, and Which To Wear

Men's Thermal Underwear Union Suits - Men's Thermal

50% Cotton 50% Polyester ~ in red only. One-piece underwear, also known as Long Johns or Long Handles. These are the same ones you can remember

Men's Trap Door Long Underwear

How 19th-Century Activists Ditched Corsets for One-Piece Long Underwear, Innovation

UNION SUIT – Skull and Bones

The History of the Union Suit, the Infamous Butt-Flap Long Johns

Union suit - Wikipedia

Undershirts: Should Men Wear Them & How Should They Fit

1864 Fashion History Timeline