Yes, I do! I hate when a guy where's shitty jeans and an ugly t-shirt that doesn't fit. Like come on, you would look so much hotter in jeans or pants or basketball shorts that fit and a solid, soft shirt or button down. I'm not obsessive about it, like a guy doesn't HAVE to be preppy/hipster/athletic, but I tend to lean towards slightly preppy or athletic guys. Your style says something about who you are! Feel free to dress like a slob if we're just hanging out on a Saturday afternoon at your place or something though. But when you're going to class or we're going out, make an effort. Even on our lazy days a lot of us girls still make an effort to do our hair and makeup so we look effortlessly pretty when we really tried.
I usually pay attention to how a guy dresses. I would say it's definitely a turn on when a guy has a great sense of style. If your "slob/mess" is just sweats and a t-shirt, that's cute, but if he has stains all over everything and looks like he hasn't showered in weeks... turn off.