in that vein for early game there could be cordage (from grass, some taller flowers, or perhaps the inner bark of trees) which is made without tools and can be woven with a very rudimentary loom made from sticks (i don't know their actual name, but primitive technology has made one, and i've seen a few other ren faire videos with something pretty similar as well) which would make a very rough piece of cloth that could be sewn into early game clothes or bags/sacks. in the video linked he's stripping off the inner bark of trees, tearing it into thin strips, spinning it using a rudimentary spindle (a stick and a fired clay whorl, though that of course makes more of a twine and you could simply use your hands to make cordage with it instead), and then weaving it into some mats using a loom that he made with a few sticks stuck into the ground plus a little cordage to tie it all together.
don't get me wrong, i'd love for the later game to have spinning wheels, multi-shaft looms (the patterns for which could be designed via voxel chiseling maybe?) and beautifully intricate tapestries and clothes.
BUT. i don't see why the basic stuff should need to be gated behind any technology at all when it's not so hard to make it with stone age tools.
another idea (though i confess that i have no idea how it could be implemented in this game) could be nålbinding, which of course would require only a wooden or bone needle, and if nothing else could be the most rudimentary and low tech way to get fabric of some kind.