http://www.ebay.com/itm/271234490961
This vintage swimsuit was made in the 1960s by Campus Sportswear. This was part of the brief resurgence of 1920s men’s styles in the ’60s. This is a late ’20s or early ’30s style, a one piece, with side cutouts. There are belt loops for what would probably be a white web belt. The suit is marked a size 28-30.

Waist (unstretched): 13″ (doubled = 26″)
Waist (stretched): 19″ (doubled = 38″)
Chest (unstretched): 13″ (doubled = 26″)
Chest (stretched): 20″ (doubled = 40″)