First of all thanks for this mod (collection) Brygun.
I was a little stumped yesterday when I tried out the weaving. Still had some flax fibres lying around from caethan's (?) self-sufficiency mod which I used before this one and I used your weaving crafts from this mod on that - I don't think this should have broken anything, only the ingredients would have been different, your recipes shouldn't work any different.
Anyway, I spun some yarn, which gave me 15ft of flax yarn for each iteration of the recipe, then used those to make cloth, which yielded 0.5lbs of cloth per iteration. First thing that I noticed was that it disregards the length of the yarn completely, it accepts 1ft or 15ft of yarn (and ofc presumably all other lengths) and yields the same amount of cloth regardless. Also, even if assuming one is supposed to use the amount that one use of the spinning recipe yields (15ft), the processing yarn -> cloth still seems extremely generous. I'm no weaving expert, though I have actually used a loom IRL before, but it seems to me that 15ft of yarn would only give you a pretty small piece of cloth.
Next thing I did was use two units of this cloth (1lb) to make a bag - again, this seems very generous, so either these bags are really small (esp. considering that for example a tunic needs about 7lbs of cloth?) or my perception is way off somehow. I always thought of bags in this game to be bigger than that, like actual sacks full of grain / flour you'd see in a warehouse.
Could you perhaps clarify if the resource usage here is intended the way it is?