Most Helpful Guy
Its hard for me to come up with something that no guys care about, but personally I tend to think that girls over-think what outfit they will wear each day. If the clothes look good it really doesn't matter to me and I couldn't care less about things matching or being in style or whatever. This probably doesn't apply to more fashion-aware guys but I'm nearly clueless when it comes to that so I don't really care.
BTW I definitely care more about how girls wear their hair.