Not to stir the pot, but I actually have real world recent experience with this. So listen up.
My wifes neice who is in her early 20's was just here for 2 weeks. Sweetest cutest girl you would ever meet. She ran around like that the entire time. It's just the way it is these days I guess with those underwear/shorts whatever the fck they are, the one thing they aren't is modest. My wife didn't say anything so I didn't either. This girl also had a repetoire of boob shirts that left little to the imagination. Just tell yourself that she is almost young enough to be your daughter then just enjoy her company.
BTW...Can anyone photoshop the Ole Miss off the shirts in my pics of her? That is the only thing about her that is a negative in any way.