A kaftan or caftan (Arabic: قفطان qaftân) is a variant of the robe or tunic, versions of which have been worn by several cultures around the world for thousands of years. The kaftan is often worn as a coat or overdress, usually reaching to the ankles, with long sleeves. It can be made of wool, cashmere, silk, or cotton, and may be worn with a sash. The caftan is of ancient Mesopotamian origin, and was worn by many middle-eastern ethnic groups.