Vintage 70’s Niki-Lu Terrycloth Maxi Robe Swim Cover Up

Amazing Vintage 70’s Niki-Lu Terrycloth Maxi Robe Swim Cover Up with front zip and waist tie, scattered all over pilling and a few scattered thread pulls. 100% polyester. Tagged as size “petite”. When flat, armpits measure approx 17” across, waist 13” across (up to 15” with stretch), hips 18” across, shoulders 14”, sleeve 5” from armpit, length 53” shoulder to hem. Bottom has approx 1.5-1.75” hemmed material. Right side pocket. Colors are rusty red, orange and yellow. Small thread pull/separation at V point where front slit starts. Being sold as is with flaws, but it’s still amazing ! Based on measurements and how it fits medium mannequin, would most likely best fit modern day US small, possibly medium.