"Slacks-chemise, a one piece affair which functions as bra and pantie, will not bulge under slacks. This is the 1942 version of envelop chemise popular during the last war."
" "Blitzies" is the name of this garment which combines blouse and pantie. Shirttail which comes around to forma a pair of brief pants also acts as an anchor, keeps shirt in place." Of course, we have no idea how you will use the powder room, but your shirt will not come loose.
Note that there are no real embellishments here, and the Blitzie's shirt could easily go with Rosie the Riveter overalls. This is because it was 1942, so fabric rationing was still in place. Lace and fripperies were not allowed, so the clothing was straight up practical.
Courtesy, Life Magazine