Oxiuly black/white dress 3/4 sleeves size L/XL

Oxiuly black/white dress 3/4 sleeves size L/XL. It says size large, but I wore it when I was an extra large because of how stretchy it is. I cannot find a tag for the material contents anywhere, but the black part is cotton and stretchy. The plaid at the bottom is stretchy, but a different material. Still very comfortable and not itchy. The zipper on the back goes all the way down past the waist. Very flowy!