TLH Women's Plus Size Summer Backless Hanging Neck Maxi Dress High Waist 100% Polyester The optional sizes are Asian sizes.Asian size is two sizes smaller than US or UK size,so you'd better buy 2 sizes up. The best way is viewing these detailed size data and choose your right size: 2XL:Length=59.05in,Breast=40.15in 3XL:Length=59.05in,Breast=42.12in 4XL:Length=59.05in,Breast=44.09in 5XL:Length=59.05in,Breast=46.06in 6XL:Length=59.05in,Breast=48.03in 7XL:Length=59.05in,Breast=49.99in Fabric:ice silk(100% polyester) Backless hanging neck maxi dress Ice silk fabrics drape super good,fine workmanship,more stylish