True vintage 80s aqua satin mermaid prom dress gown modern 4

Absolutely stunning late 70’s - 80’s prom dress in a beautiful deep aqua satin. Roses around the neckline with off-shoulder cut. Mermaid fit skirt with big bow on the back. Really lovely condition- looks like it’s been in the dry cleaners bag since the 80’s! One spot on the bow and slight discoloration in armpits, see photos Bust 34.5” Waist approx. 26.5” Tagged a size 12 but equivalent to about modern 2-4 ( I’m the higher end of 4 and it’s too snug to zip all the way)