Mystic society members wear elaborate costumes that reflect the theme of their parade, ball or float. Costumes include custom-made hats or feather headdresses, though some societies do not require this. Most of the traditional krewes require riders to wear a mask that is sufficient to conceal the rider's identity. Excessive cutting of the mask or removing the mask at any time during the parade is grounds for dismissal from some societies. Some mystic societies also require that members wear masks during the society's ball (typically held the same night of its parade).