Some of the smartest women wear short skirts, look fashionable and take care of themselves. It has to do more with fashion and from what I have noticed the women with the short skirts are smarter than those who look like Hillary Clinton. (It's like comparing Fox news chicks with CNN chicks... Not in the same league when it comes to brains or looks).
We have to acknowledge that how you wear maybe depend on various things,like your budget,your fashion sense,etc. So when it comes to intelligence and clothes,in this case being revealing clothes,we cannot say either one influences the other. It would not be wise to say that women who like revealing clothes are not intelligent because "You cannot judge a book by its cover".