This is a thin Chinese dress. It's not a genuine Chinese dress, but rather a dress with a Chinese dress-like pattern and stretchy fabric, without any raised details. It's a slim fit, size S. I think it would be easy to wear as pajamas in the summer. There are no noticeable stains, but please understand that this is a used item as it has been stored at home for a long time. It will be packed compactly for shipping.