This is a dress with a side zipper. I've only worn it once, to a formal event. It's 100% polyester, so it's hand-washable. The size is marked as 3 on the tag. Based on the flat measurements, I think it's a size M. [Flat Measurements] Length: 100cm Width: 43cm Waist: 38cm Skirt Length: Knee-length Color: Pale Pink Season: Spring/Summer