I can't control what others do or wear, I can only be responsible for myself in such situations. If they want to show lots of skin or act provocatively or even make fools of themselves, that's their business --unless they are doing something directly harmful to me (apart from simply evoking my personal disapproval).

As to a guy grabbing/patting my behind to 'give me a boost'- well i'd let him know loud and clear in front of everyone that that was totally inappropriate.