I got this swimsuit as part of a lot of ’50s ones.  This one has a lower rise and higher cut sides, so even though the tag looks from that era, I’m thinking they’re a bit later.  They’re bright red in a shiny satin type material. The front is lined and they have a drawstring waist. 

 Waist unstretched: 13″ (doubled = 26″) 

waist stretched: 18″ (doubled = 36″) 

Rise: 8-1/2″ 

Side Seam: 4″