There was a new wonder product in the 1940's that was beginning to be used for everything --latex rubber. I'll bet you're wondering what this is.
Well, wonder no longer!
Seems like a lot of trouble to go through to keep your blouse tucked in until you remember that slips were nylon. Blouses were nylon. And what is the chief attribute of nylon? Slipperiness!
Here is the box.
As if that is not complicated enough, check this out.
See that line in the middle of the box at the waistline? This pulls out and pulls the blouse out of the skirt! See the skirt by itself, below.
These are still in pretty good shape for a rubber product. I can't say as much for the blouse tender. Maybe because it's "live".
To finish off, here is a product to keep your feet in your shoes while wearing slippery nylons.