I'd like to solicit tacit's take on this:
In the case of people, hair on your head may be less functional as far as keeping you warm or cool and requires a lot of maintenance, but it does have a lot to do with whether others find you attractive. It's big business. Females spend a lot of time and money making sure their hair looks right. So, does it function like, say, brightly colored feathers, to determine if you are good genetic material for mating? And why?
