http://www.ebay.com/itm/281124831988
These vintage swim trunks were made in the 1960s. They are a long legged style, with a patterned waistband.
Waist (unstretched): 15″ (doubled = 30″)
Waist (stretched): 20″ (doubled = 40″)
Side Seam: 14″
Rise: 12-1/2″
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Now on eBay! LINK
This jantzen swim suit was made in the 1950s. It is a silver stretch knit material. It has the famous Jantzen diving girl on the hip. The gront is lined, the waist is secured with a draw string and there is an interior key pocket. There is a tag inside reading “Robert F. Mertz”. The original owner? If so, it looks like he barely every wore it- this suit looks brand new. The workmanship is a cut above other suits of the period- all you have to do is look at the embroidered reinforcement around the drawstring to tell that.
Waist unstretched (side to side): 11″
Waist stretched (side to side): 15″
Rise: 12″
Side Seam: 8″
Now on eBay! LINK
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″)
Rise: 12″
Side Seam: 7″
This deadstock 1950s mens bathing suit is made of red ribbed stretch nylon. 
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