The ULTIMATE in AMC style: a bright-red wool onesie for adults. For yourself or the show-stopper in your life, deck yourself out in a union suit created by our neighbors at Minus33. The Union Suit is a historical undergarment that has been around since 1868. First created in Utica, NY, and perfected in New Hampshire, our union suit features a drawstring waist, plastic buttons on the top half, and flat snaps on the bottom.