Bought for an event a few years ago that I ended up not attending. What sold me the dress are the lacey sleeves and the slit. There is no information tag regarding the material, although it feels like polyester. Labeled XS but it fits me a little loose (I'm typically a size 2 in Reformation). The length is considered midi, although it falls as maxi since I'm petite (I'm 5' tall). I would keep this piece long-term, but I'm pregnant and am in need to make space in my closet for new better-fitting clothes. Let me know if you have any other questions!