…for school/college sports? I know what the original wrestling “uniform” was 
, but would be extremly shocked to learn if it was ever used at American schools or colleges. I have heard stories that swimsuit-like briefs were once used, but even that seems farfetched.
Link perhaps slightly Not Safe For some Work places.
[ulr]Amateur Wrestling Collectibles Gallery- Photos by Tom Fortunato, Rochester, NY]Various wrestling uniforms (or lack of them)