Here is a vintage Lee Swimplay swimsuit.  I believe this is from the 60’s.  It is stretch nylon.  The size is 12/34 but in my opinion vintage swimsuits run small.  It is 15 1/2 inches arm pit to armpit.  Leg opening is 21 1/2 inches.  The suit has snaps in cups to accommodate an extra cup but I do not have those.  Suit needs stitching in back as pictured which is an easy fix on sewing machine.  Has panel inside front waist down.  Thanks for looking.