Check places that sell Zentai suits, such as "Zentai Zentai". That's just one, and I never used it. Many will do custom orders based on your measurements.
The higher the spandex count, the greater the stretch. Also look for 4way stretch fabric. When sewing use either a serger or a zigzag stitch. This will allow for the seams to stretch with the fabric. The heavy weight the spandex, the less see through it will be, but may be warmer. Also some...
Thought people would find this interesting.
https://www.hemmings.com/stories/2021/10/06/the-herkimer-battle-jitney-lives-and-the-new-owner-plans-a-full-restoration