Symbolic of life, hair bolts from our head[s]. Like the earth, it can be harvested, but it will rise again. We can change its color and texture when the mood strikes us, but in time it will return to its original form, just as Nature will in time turn our precisely laid-out cities into a weed-way.
It was an odd situation. For a century and a half, men got rid of their own hair, which was perfectly comfortable, and instead covered their heads with something foreign and uncomfortable. Very often it was actually their own hair made into a wig. People who couldn't afford wigs tried to make their hair look like a wig.