Vintage Navy Blue Beaded and Sequined Cocktail Dress Size Large

This dress is 100% silk shell with a rayon lining. It says a size large, but it runs big for a large to me. I would say it’s a woman’s size 16-18. Measurements Armpit to Armpit 23” Armpit to bottom hem 30” Waist measurement taken lying flat double this number 21” Thanks for looking and message me with questions, or your offer.