As a guy, I sort of understanding where your coming from, but as you say, we're all different. To understand if a woman is being provocative or not, first off, you need to understand what a woman thinks is provocative - and you could only understand that, if you understood what they think a man finds attractive, assuming we are speaking hetorsexual here :) .... hence the crack whore in the photo.
Sexuality and sexual provocation is the most subtle of things. To really know the answer to your question, you would have to know how your hormones are dressed rather than the person that contains them.
Personally for me its back and shoulder muscles - show me a healthy Trapezius or Deltoid any day :) Some 'women' that I have met, find things like 'wrists', shoulders and 5 day beard growth attractive.
Its always seemed to me that people over estimate the power of presentation, and underestimate the power of those unseen forces that lay beneath the skin.
You can certainly make an impression with dress, and you can shock or make a statement, but if you believe that's going to get you laid, then that would be a rather unfortunate mindset.
Rather than associate someones dress with their sexual prowess or vibrance, we could alternatively consider it a gauge of just how desperate someone has become.
Anyway, very brave of you to post this Alex :) U crazy man !