Vintage 1980s short sleeve floral summer dress Navy

This piece is so pretty but too big for me. Lightweight voile cotton in a ditsy floral print with patterned trim. V-neck with buttons down to the waist. Elasticized waist with belt loops at the sides. Pristine condition. Bust (pit to pit): 19" Waist: 11-16" stretched Waist to hem: 31" Shoulder to waist: 19" Size marked 9/10. I think this would be good for a medium.