Black lace sleeveless lined dress, wear loose or with belt, 12, fits more like 8

This is a beautiful all year round dress - shown with belt- will include if desired- did not come with dress - or wear without- dress still nips in slightly at waist -19 inches pit to pit -36 inches long from back of neck - zipper and 2 buttons in back -lined - not sheer - fits more like a size 8