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This vintage swimsuit was made in the 1950s. It is not marked as to its manufacturer. It feels like some kind of heavy knit nylon and cotton blend. There is elastic in the waistband, and holes for a drawstring. They are lined in the front and have a internal key pocket. The elastic is a bit dead, but since it is exposed, it wouldn’t bee too hard to put new elastic in. The fabric has a lot of stretch to it- as you can see from the measurements.
Waist unstretched (side to side): 13″ (doubled = 26″)
Waist Stretched (side to side): 17″ ( doubled = 34″)
Side Seam: 7″