Secondary shower thought, an image of Captain Caveman should be the image representing humans on the Wikipedia page.
Tertiary shower thought, we probably started wearing clothes because our own hair used to be our clothes, and we wanted to replace the hair we cut off when we started grooming.


… I haven’t cut* my hair in over a decade, and it’s been more or less the same length for the past 3-4 years. After a certain point your hair falls out regardless of cutting, and for most people that’s around 7 years.
EDIT: Forgot to include the actual length, which is core to the point. It’s about waist-length for me, but some people’s hair does get longer.