19. PLAYING ATTIRE and HEADGEAR*
19.1 Players must wear dress pants or skirts and a collared shirt while playing on stage or in a staged event.
19.2 Headgear and electronic listening devices shall not be worn without prior permission of the Organizers. Such permission must be given to players whose religious or moral duties require that the head be covered or to players with a medical condition verified by a physician (e.g. hearing impairment, Alopecia Areata, chemotherapy or radiation treatment).
*Quote from NDFC rules section 19 page 13.