http://www.ebay.com/itm/281692399016
This vintage swimsuit was made in the late 1930s-mid 1940s. They have an incredible textural ribbed fabric, tunneled buttonhole beltloops, a tri-tone belt, buttoned key/coin pocket and built in supporter.

Waist (unstretched) – 16-1/2″ (doubled = 33″)
Waist (stretched) – 20″ (doubled = 40″)
Side Seam – 10″
Rise – 13″