No certificate. Based on the texture of the yarn and its crispness, it appears to be linen, possibly Jofu (fine linen). No noticeable stains or dirt were found. I hope someone who can wear it will be happy to have it, as it doesn't fit me. Size: Length: 158 cm Sleeve length: 67 cm Sleeve width: 34 cm Sleeve length: 49 cm Front width: 24 cm Back width: 30 cm *Please note that these are amateur measurements. *There are fold wrinkles due to long-term storage. Please refrain from purchasing if you are looking for a new item.<(_ _)>