A kaftan or caftan ( 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. Through its dissemination and evolution, the kaftan has acquired different styles, purposes, and names depending on the culture. In many regions with a warm climate, the kaftan is worn as a light-weight, loose-fitting garment. The kaftan has served as a symbol of royalty in some cultures and as a symbol of marriage in others during some parts of history.