XS ?? Vintage 70's halter Red polyester Sleeveless Dress UNION MADE in USA

This item is pre-owned and vintage so it may show some signs of use or wear from washing. It is a little dirty on the front. There is a little fiber sticking out on the back and a few tiny spots as well. See photos. Missing size tag and material tag. MIGHT POSSIBLY be a size XS ?? Please check measurements below. ======================== BUYER IS RESPONSIBLE for comparing the measurements below against their own clothes to ensure a good fit BEFORE purchasing this item! ALL SALES ARE FINAL. No returns or exchanges. ======================== APPROXIMATE measurements: Armpit to armpit 14 1/2" across laying flat Empire waist is 12 1/2" across laying flat The FULL LENGTH of the dress from the shoulder (right at the neck) to bottom hemline is 58" long The SIDES of the dress from armpit to bottom hemline is 47 1/2" long Arm opening 9" wide laying flat