A playsuit is an item of lingerie consisting of an all in one design where the top half, similar to a negligee, is joined to the bottom half, similar to a panty or shorts.
Ooh, then I guess the panty raid last night was totally uncalled for. Ok, I am going to take a shower and today I will be singing Jim Croce's Leroy Brown.
In terms of underwear in the 1940s, panty girdles were the norm, though panty girdles were generally constricting and not conducive for playing sports.