This is 100% Ramie, which when you google, it says it is a natural fiber similar to linen, which is derived from the Chinese nettle plant! It looks and feels like linen to me. The fabric and workmanship of the blouse is amazing. I do not see any flaws. Chest measures measures 25 inches across so I obviously is oversized and can fit a medium or large size as well. Length is about 22 inches at the longest point in front and is about 27 inches at the longest point in the back.