Depends on the vibe you get from the person, not their clothes. Of course there's going to be those girls who aren't into black clothing and a darker look. Personally I'd rather be with a loner girl how dresses in dark clothing and has insight on the world around her over a girl who's outgoing but when times get hard will leave. It's the person, not the clothes. So to wrap up and answer your question, no it's not weird or creepy.