The wardrobe update I am planning for the next release will have the outfit properties. Things such as if it shows your stomach, cleavage, ass as well as things such as if it's regarded as slutty or see through.
I don't really want to give a flat rating though because allure changes based on so many things and is quite a complex calculation. For example some people were confused early on why allure was higher when outside. Turns out its because they had no bra on and a thin top, so while outside her nipples were poking through the top adding to allure.