Stunning and rare find. De Weese USA made lame swimsuit. It is not sized but I would venture a contemporary Med to Large it is shown on a tall medium sized mannequin and was large in bust and waist for her I had to pin the bottoms to show a more realistic look if fitted. It seems to be unworn but does have a few very light piling probably from decades of storage. No other issues noted. No odors or stains or damage.
I did measurements the best I can. Hope they help
TOP:
From end to end is apx 27" across without stretching at all and there is a lot of stretch.
The cups are apx 6" wide and 5.5" top to bottom of cupping
BOTTOM:
Waist is apx 32" without any stretch which it has stretch
Thigh holes are apx 22" plus stretch to add
Rise from the center crotch to lowest point in the front is apx 10" and 15" from crotch to the highest side area
Rise from center crotch to top of back of bottoms is apx 16" tall

This item is sold from an excellent, highly rated vintage boutique in Beautiful Eastern Wa.