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This swimsuit was made in the early 1950s by Aetna. It is their Miamian model, for which I found newspaper ads in 1952 and 1953. It is made of Acetate, Nylon and Rubber, in a heavy textured fabric. The front panel has stripes, the back panel is plain white. There is a bit of light staining on the back. They have a drawstring waist.
Waist unstretched: 10-1/2″ (doubled = 21″)
Waist stretched: 20″ (doubled = 40″)
Side Seam: 8-1/2″