80s prom dress

Vintage 1980’s strapless sweetheart neckline fit and flare prom dress. No size tag but shown on a size 4 mannequin who’s measurements are bust 33” waist 27” Dress measurements: Armpit to armpit 15” Waist across 13.5” Length from armpit to hem 39” There is a snag on the front bodice which I point out in a photo and an area at the waist which has been repaired (also pointed out in a photo). I would equate this dress to a modern day street size 4-6.