In the 1960's there were 100% non-stretch Nylon Ocean Champion suits with 6" sides, and Ocean Brief suits with 3" sides. They came in size 28, 30, 32 etc. so I could downsize and look as flat as a Ken doll. I loved the look and feel of that tight squeeze as I pointed down, and wore them at the beach. Here's a link to photos of the suit and packaging
https://vintagehaberdashers.com/tag/ocean-champion/