Vintage 80s Prom Strapless Dress with Bow

Late 80s/Early 90s vintage blue/purple sequined strapless dress. Says size 8, FITS LIKE SIZE 4 which is why I am reposhing. See light marks in pictures. It’s in great condition and I’m sad it was too small for me. Dress zipped lying flat: Pit to pit: 15” Waist: 12 1/2” Length top of bow to hemline: 30”