> it's just some sub-cultures, teens and troubled personalities that "express themselves" through fashion (the most shallow thing you can do, a juvenile thing in any case)

Are you claiming that dressing to express yourself is shallow and juvenile?

Do you just...buy the first thing you see at Goodwill that fits you? I'm not sure how one could avoid dressing to express oneself, to at least some degree, unless you exclusively wear work uniforms or hand-me-downs.