[knarf]

" .. we know that body lice or clothing lice almost certainly didn’t exist until clothing came about in humans.”

Stopped right there.

Moog put on a bear skin and .... lice magically appeared?

[allmendream]

Yes, just as when humans invented nylon, a bacteria that digests nylon “magically appeared”, i.e. it evolved from bacteria that previously were not able to digest nylon.

[decimon]

Moog put on a bear skin and .... lice magically appeared?

Hair is hair.