Wait wait wait wait... I thought girls dress up for themselves. You mean, all those girls who say they don't dress up for male attention are wrong? Nawwwwwww
But to answer your question, I like it when they look nice instead of slumming around looking like a hobo. But that doesn't mean she needs to dress up like she's going to a gala. It just means don't look like a hobo.
I won't lie, I hardly notice. If a girl looks pretty I'll pay attention to her and not to what she's dressing. Or couse it can help, but personally I don't notice much. I'd like to pay attention to these details a litte more though...
I would not mind how a girl dressed because if a guy loves a girl he would love her no matter what she wears because she is still the same person. To answer your question some guys care (most of them are pricks) those who don't 69% of the time they will stay by your side no matter what