Penny Arcade are the guys behind PAX, who gave us this gem.
" “Booth Babe” Policies
PAX has a strict ‘no booth babe’ policy with the purpose of creating an environment where everyone can feel comfortable and welcome, and the focus is on games, not hired booth staff.
Booth babes are defined as staff of ANY gender used by exhibitors to promote their products at PAX by using overtly sexual or suggestive methods. Partial nudity, the aggressive display of cleavage and the navel, and shorts/skirts higher than 4” above the knee are not allowed. If for any reason an exhibit and/or its contents are deemed objectionable to PAX management, the exhibitor will be asked to alter the attire of its staff.
Cosplayed characters that are playable in-game are an exception to this rule (within reason), and exhibitors must obtain permission from show management prior to the show.
If for any reason an exhibit and/or its contents are deemed objectionable to PAX management, the exhibitor will be asked to alter the attire of its staff or remove those staff from the show.
Cosplaying attendees may be asked to alter or modify their costume if it is considered overtly sexual."