This new-with-tags dress is a nice jersey knit, made up of 61% Polyester, 33% Rayon and 6% Spandex. It's a great day to night dress, and the included fabric belt is removeable. There are pockets, making it a perfect wear-and-go piece. The fabric is incredibly soft and the waist has a lot of stretch, so this is very comfortable to wear! Size 12. Measurements taken flat: Waist = 16" unstretched, Pit to Pit = 21". There is a snap closure at the bust. I am a top rated seller and fast shipper. I discount bundles of two or more items generously so be sure to check out my closet. This item is coming to you from a smoke free and pet free home.