A cloak is a type of loose garment that is worn over indoor clothing and serves the same purpose as an overcoat; it protects the wearer from the cold, rain or wind for example, or it may form part of a fashionable outfit or uniform. Cloaks have been used by myriad historic societies; many climates favor wearing a full-body garment which is easily removed and does not constrain the wearer with sleeves. Over time cloak designs have been changed to match fashion and available textiles. (source)