The Halny Vest is made entirely from Polish Merino wool. The small needle size gives it a polished look, while side slits makes this a wonderful piece for comfort, movement and layering. Approximately seventeen hours of hand knitting goes into making this vest. Size Guide XS fits a bust of 80 - 85 cm (33.5 - 35.5 inches), with a finished length of 53 cm (20.75 inches). Pit to pit garment measurement is 18." S fits a bust of 85 - 90 cm (35.5 - 37.5 inches), with a finished length of 55 cm (21.75 inches). Pit to pit garment measurement is 20." M fits a bust of 90 - 95 cm (37.5 - 39.5 inches), with a finished length of 57 cm (22.5 inches). Pit to pit garment measurement is 22." L fits a bust of 95 - 100 cm (39.5 - 43.25 inches), with a finished length of 58 cm (22.75 inches). Pit to pit garment measurement is 24." XL fits a bust of 100 - 110 cm (43.25 - 47.25 inches), with a finished length of 60 cm (23.5 inches). Pit to pit garment measurement is 26." Please reach out to us on the Contact page if you have any questions or specific requests regarding sizing. Model is 5' 6" and wearing a size M