Hominids did not wear clothing; with thick fur, they did not need clothing. So how did they get from that to no fur and having to have needles and thread???
Needles and thread, in the modern sense? No.
But tanning hides and utilizing the coats of fur from your game is not only not far-fretched, it’s very likely.
Your survival depends on not wasting anything from your kill. Bone marrow took a lot of work to get to, but very worth the effort. Teeth, hooves, bones, etc. could all be (re?)purposed as tools, and if not, were even kept for adornment.
Even if you have a nice personal coat of hair, are you telling me you wouldn’t wear some animal furrs when it’s freezing out?
“Hominids did not wear clothing; with thick fur, they did not need clothing. So how did they get from that to no fur and having to have needles and thread???”
Whenever a feature disappears it is because that not having that feature became advantageous. For example, if the climate became warmer or the hominids migrated to a warmer area, bare skin would be more efficient for cooling. Full-body sweating, as we do, doesn’t work well when you are completely covered by fur.