How do I make my girlfriend stop dressing so provocatively every time she goes out?

My girlfriend is very hot and has an amazing body. She wears overly provocative and revealing clothing all the time. I mean they're very sexy and aren't cheap at all (she buys designer/brand name clothes), but they attract other guys' attention a lot and I don't like other guys drooling over her all the time, it makes me uncomfortable. But she likes getting attention and showing off. What should I do? Should I be concerned or just be glad that I have a great peice of eye candy to show off on my arm?