Where does the clothing and attitude come from when people are involved in certain music genres (or any culture for that matter)?

For example, fans of metal music having long hair and tattoos, or hip hop fans wearing larger sized clothing, or hippie clothing. Where did all these styles originate? How about bikers? Why aren’t bikers wearing dockers and polos lol? Where did the dockers and polos style come from? I know this is pretty vague, but any input is appreciated.