Green Silky Kaftan Tunic with Embroidery

This is a vintage tunic. No labels inside. It feels like it may be silk but I'm not positive. Missing a button. It appears there was a sticker on the inside at the neck that left some residue. It does show through to the back (see pictures). Slight discoloration at the underarms, not very noticeable. Measurements: Bust: approximately 22" across. Length: approximately 31". Feel free to ask me any questions!