I’ve never purchased Negative before and jumped on the chance when some pajamas came on sale. I can go between an extra small and a small, but since they look like flowy PJs and I wasn’t exactly sure about the material, I decided to go with the smaller size XS. The top fits great, the material is very comfortable. The shorts do fit, but I would’ve preferred the waist to have a tiny bit more stretch. I guess maybe I should’ve sized up on the bottom but I decided to gamble. Item was final sale.