80's vintage jacket size Small

Very good vintage condition. No flaws. No hood. Two pockets. Shell: 100% nylon; Lining body (not including the sleeves): 100% polyester. Tag size S, but really fits Medium easily. Shoulder to shoulder: 19.5in.; Armpit to armpit: 23.5in.; Armpit to hem: 13.5in.; Sleeve: 22in.