I have to disagree with the notion that dressing exclusively for oneself, even in a deliberately shocking manner, is solely a matter of personal freedom. I can imagine a lot of different get ups that one might find personally fulfilling which would violate any reasonable standard of decency...stuff I wouldn't want my kids to see at the mall. And to narrow a bit to the topic, one outlandish CD presentation may reinforce stereotypes that hold back all of us who go out in public.
I don't wish to intrude upon, or interject myself into the lives of strangers, by virtue of how I'm dressed. I wish to leave them to their lives and live my own. That's not group think, but rather common courtesy.