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.
This isn’t entirely accurate. The length limit doesn’t check if they reached it. Hairs are dead tissue. Instead it is the amount it grows by before falling out.
Nails tend to not fall out but experience Abrasion from use.