a synthetic or natural-looking head covering that covers all or most of the head in order to look more stylish or attractive. a head covering of the same kind that is worn as part of a costume, disguise, or other formal attire.a synthetic or natural-looking head covering that covers all or most of the head in order to look more stylish or attractive. a head covering of the same kind that is worn as part of a costume, disguise, or other formal attire.