Maternity pajamas! The fabric is cotton! It's a set with a dress and pants, but I'm selling the pants because I only wore the dress and didn't have a chance to use the pants. The size is M to L, but the waist can be adjusted with buttons, so you can wear them even if your belly gets quite big. I think it will fit up to about XL. Black and white checkered pajama pants with an elastic waist, size M-L. - Design: Black and white check pattern - Size: M - Features: Elastic waist Thank you for looking. Preparing for childbirth, baby, mom, childbirth, maternity, baby supplies