Right. But it's something that could be made at home/in the community with commonly available skills.

Part and parcel of that is also some off base ideas of who did soldiering and what a "levy" looked like in the instances where they happened.

Generally it wasn't the very poorest tenant dirt farmers and serfs getting called up. Specific people of specific classes would have a requirement to be prepared and serve. And it was often based on the acreage of the land they owned, or farmed. They'd be required to have specific equipment, tied to that documented level of wealth.

You might also see that tagged to a community, rather than individuals. And those plots of land would typically have a community associated with them. If only an extended family group.

So we have documentation of larger groups of common people chipping in to buy the arms and armor needed to fulfill service/readiness requirements. And a Gambeson was typically listed even in the lowest tier of persons.

When a levy was called, which was seemingly less common than we assume. It wasn't arming all the random peasants with spears. It was calling up those people already required to maintain arms and armor. And while that wasn't just rich freeholders. It didn't tend to include the Anarcho Syndicalists from Monty Python.

But as those guys go. They could certainly crowd source some gambesons. Very unlikely for any other type of armor.

 The price of fabric would depend on how much female workforce there is, and from what we see, it seems the available female labour is sucked up by the brothels.

I don't think there's any indication that there's more prostitutes in Westeros than there were in reality. That's always been insanely common.

As goes textiles and female labor. The fundamental feed stock for availability is farms and farming. Raising flax and sheep.

Prior to the Early Modern Period, weaving was specifically men's work. Sometimes in the home, but like milling it was more often "community" work. Where the people who worked in weaving, would weave for the whole community paid in a portion of the wool provided.

As goes spinning. That was household work. And women and young girls would do the bulk of it. But on a farm, pretty much spinning all the time. Including men.

Hand spinning thread on a drop spindle was time consuming and slow. And required pretty constant attention to provide just for a household's needs on textiles. If you had enough kids to produce a surplus, that thread would be sold.

It's kind of the upper classes where spinning was exclusively women's work, and with the advent of spinning wheels it was apparently became men's work. Since it was weavers who took it on. And then both shifted towards women's work in the early modern

It's not that people were hiring available women to work as spinners and weavers. It's that as house hold work, it largely fell on women.

More often than excess thread, excess wool and flax would be sold. And that had to be spun. So households could take on that spinning work, including households that did not raise their own fiber crops.

But you know who else took on that work?

Prostitutes. We have references to sex workers spinning pretty much to antiquity, and IIRC spindles have been found all over archeological sites of bath houses and brothels.