Role Playing as Foreplay

My wife enjoys role playing and taking on a different identity. We have done some of the more "common" scenarios (teacher-student, nurse-patient, police officer-detainee). Recently we purchased a pirate outfit for her and it worked well since we were able to use the whole booty as treasure theme. We want to try new ideas and were wondering if there are any unique scenarios that have been tried. What costumes/attire? Specific sexual actions?