This is the Elegant lounge-wear Bottom I am guessing because it is so old they didn't change it.
This is the Magnificent Dancer Bottoms today.
This is the zoom in. I agree it looks pretty funny. Kinda like they brought the fabric down the thighs but it doesn't look right at all. Plus they are to high. This is not he 80's we don't wear undies like it is. lmao