But that doesnt answer his full question. In what ways did she act slutty? I really cant think of any, offhand. Clothes are only one half of the equation. You can look at any girl and automatically think slut or good girl based on their clothing. And if you spent some time talking to a so called 'slut' in real life, you may find that those rumors are false, and completly based on her clothing.
I could wear a super short mini skirt (which I often do, it's hard to find thrift store skirts that fit my height) and a halter top, but it doesnt change the fact that I'm a virgin. A sexually active girl could don a turtle-necked sweater and a pair of sweat pants and that wouldnt change the fact that she's sexually active.
Actions define a person far more than their looks.