I was thinking of throwing away the stained underkimono, but I saw someone selling just the sleeves, so I'm doing the same. The very top fold of the sleeve is slightly yellowed, but it's not very noticeable and shouldn't be a problem for use. There are no other stains or spots. I think it's probably polyester. Sleeve width: 32.5 cm, Sleeve length: 48 cm The sleeves have been cut from the underkimono with scissors. How about making replacement sleeves? #UnderkimonoSleeves #ReplacementSleeves