We have a pair of red/pink and white shorts made of Nylon with an elastic waist.  They are a L  (?girls I will give measurements to follow) and made by Marko Dangelo.  They measure about 23" around the unstretched elastic waist - stretched I would think it would be comfortable for about for a 26" - 28" waist.  Waist to crotch in the front is about 12" and the side seam is about 12" in L as well.  The widest portion of the hips is about 37" around.  I believe these date to around the 1980's or so.

Shorts Nylon Retro girls L Vintage