Both. Women dress provocatively in order to get attention. Otherwise, there is no reason for the various provocative clothes to be put on. They could wear things like mean, the cover up and aren't so tight.

They do dress in low cut shirts showing cleavage because it draws attention, otherwise they could dress in another way that doesn't show cleavage. As men don't dress in the same way with low cut shirts because there is no sexually provocative purpose for it.

Men need to be able to control themselves from raping women or assaulting them, but the provocative dressing stimulates attention and attraction. If women didn't want the attention or attraction, they could change how they dress and be more "conservative" or "modest" in exposing their sexualized attributes. The whole purpose of dressing provocatively is to draw attention.