Vintage Fabric Flag Tan Through One Piece Swimsuit 70’s/80’s Open Back Women XS?

I don’t know the decade but looks 70’s possibly. This is a fabric tan through bikini. Has adjustable ties throughout. An open back with adjustable ties. Has elastic on the legs. There’s no other elastic anywhere else on the swimsuit. Has a small spot on the swimsuit. Made of regular non stretch fabric. Not traditional swimsuit fabric. Really cool piece! Haven’t seen one like it! No brand or size tag. See measurements. See all photos