The idea of the Slut Walk goes like this: ladies all get together to teach men that just because a woman dresses a certain way doesn't give them the right to act on their impulse and attack women. Not only that, but it tries to get rid of the stigma that any girl who gets raped or judged is wearing something skimpy or that they are a slut. It all goes back to feminism, and the attempt to get it through our heads that it isn't fair to shame women for just being human. After all, being sexual is a human thing, but when it is being owned by women, it's a very dirty practice.
It even tries to say that even if the women choose to own their sexuality, It does not mean that the guy has any right to force it out of her because then, she looks like less of a whore than him. After all, the idea of a whore is that they will f**k anything they please without control, and as much as this would most definitely apply to some dudes, it never does get applied to the guys.
As for the whole thing about women provoking men by the way they dress, I do get your point. Some ladies don't really understand that when you are around a man, they will get horny and think something about you. It will happen all the time, whether they like it or not. So, for this, they have to be extra responsible for the language they send. However, it's apparent that even doing that will not stop women from getting raped or judged. One girl was even holding a sign that she was wearing a hoodie when she was raped. Nothing skimpy or anything of that nature
So, when you think of the Slut Walk, think of the women who are trying to fight for their right to be women (sexuality and all) without 1) being attacked by men for it and 2) being used for men's own amusement.