I think you are thinking flax, not cotton.
At least I think the Herotling culture has flax (and therefore linen cloth) as their vegetable fibre material, as the pre-columbus europeans did.
Cotton apparently has been known in asia for three thousand years, so parhaps one could trade for some cotton cloth.
I still think magic items mage for good trade. One doesn't have to know sorcery to appreciate a (sorcerously created) gem that glows with a steady light, for instance.
-Adept
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