When I check the material costs of crafting gear, cloth is the one armor class which oddly requires sometimes only maybe a tenth of the material costs to craft compared to the other ones.
Like, if a piece of crafted epic gear costs a couple thousand for the other armor classes, it is a couple hundreds for cloth items.
In addition to the fact that everybody that kills humanoids is a source for cloth, Tailors themselves can increase the amount of cloth they get from humanoids by up to 150%.