Halloween costumes are costumes worn on or around Halloween, a festival which falls on October 31. An early reference to wearing costumes at Halloween comes from Scotland in 1585, but they may pre-date this. There are many references to the custom during the 18th and 19th centuries in the Celtic countries of Scotland, Ireland, Mann and Wales. It has been suggested that the custom comes from the Celtic festival of Samhain/Calan Gaeaf, or from the practise of 'souling' at Hallowmas. Wearing costumes and mumming has long been associated with festivals at other times of the year, such as on Christmas.