Skimpy/revealing clothing, I imagine. But no, one does not need to dress like so, in order for guys to come on to her. I dress, fully clothed, and I STILL have to deal with guys who can't seem to grasp the meaning of "no".
And the learn self-defense part of the top comment is just out of place. I shouldn't have to learn how to fight men back while they can't hold their 'sexual urges' in.