HeathCliff Rothman submitted this picture of his mom, Micki, in a playsuit in the 40's. And to him I tip my hat (also because his name is HeathCliff so that's just what you do). I would like to wear this outfit and not look like Lilly Tomlin playing a 6 year old. But I'm not Micki, by a long shot.
You can check out a few modern versions like the ones below over at Kaboodle.