OP you are conflating two things.
One is that whatever a person wears does not mean they have agreed to have sex with anyone. Even walking around naked with a big red arrow pointing at her fanny.
However people can wear clothes that sexualixze them, that send a message to others that they are wanting to be looked at as sexual. Not as kind of an "oh what an attractive accountant" but instead that is the main point of the outfit.
People sometimes wear outfits like this on purpose, I am sure many of us here have, which is why we know that it is something young women trying to attract males sometimes do.
Can someone wear this kind of thing without such a purpose? Yes, it's possible. In some cases, particularly with younger girls, they just see it as fashion and are very naive about the bigger picture. Often these girls are a very early stage of being sexually interested themselves.
Older women who are supposedly doing it just for themselves - that is tricky to unpick. The problem is this - if you are saying it's wrong for men to sexualize women, or that they personally don't want to be sexualized,why would anyone wear clothing that is deliberately designed to sexualize women, and that women themselves use for that purpose when it suits them?
It's difficult not to see it as being in some way disingenuous.