This is a gauze material set-up. There was no material listed, but I believe it's probably cotton, and it has a soft feel. I think it would also be good as pajamas. It's unused, having only been pre-washed, but please understand that the material is somewhat wrinkled and that it has been in someone's possession before you purchase it. The size is approximately equivalent to 100. T-shirt → Width 43cm, Length 36cm Half pants → Length 29cm Color: Black Sleeve Length: Short sleeve Season: Summer Type: Short-sleeved T-shirt