The waist is fully elasticated, but there's also a side zipper. By shifting the sides front and back, you can change the cut of the top, allowing you to enjoy two different designs and a beautiful silhouette. The waist is approximately 66 cm, and the length is approximately 81 cm. The material is 35% cotton and 65% polyester. It's light and smooth, so I think it's comfortable to wear. I've worn it once. It was too big for me, so I'm selling it.