This vintage men’s bathing suit was made in the 1930s. It is navy blue wool with a waffle pattern weave. Double racing stripes down the sides, and a tunneled belt. Diamond shaped crotch gusset, d-ring buckle. The front is lined. I see one small moth bite on the back.
Waist (Unstretched): 11″ (doubled = 22″)
Waist (Stretched): 17″ (doubled =34″)
Side Seam: 14″