They would be interested, but it's more likely that they're so far north that they won't see much of it soon in trade(after all, they produce their own silk, they can meet enough of their own market for silks that they're not likely to be a high priority for merchants looking for K8P silk buyers), and instead a lot of any we-silk is going to get bought out by rich people closer to Barak Varr and Taalites all over the place(if you're devout you're not supposed to use metal armor, so We-silk is an amazingly effective addition to the field of cloth armor that will fascinate Taalites and may start a major fad/fashion.)
My dude, I don't think you realize the real potential of We-silk armor.
We're talking about very light, full-coverage, extremely stab-and-slash-resistant, fire-resistant, somewhat flexible armor that is also thin enough that you can put a good amount of padding over or under it.
It doesn't render steel plate armor obsolete because you can actually combine the two for increased effectiveness. It doesn't render ithilmar obsolete because you can't make any weapons or stiff objects with it (and ithilmar may be a fair bit lighter, even). And it obviously doesn't render gromril obsolete because gromril is WAY tougher and is also second to none when it comes to runework (and you can make amazing weapons out of it). Leather/padded armor won't be obsolete because you can combine it with silk armor and padding will be pretty important for really bringing out the silk armor's potential.
Otherwise, though? Any general/soldier/wizard/knight that understands what it is and what they can do with it (and can obtain it affordably) will want it.
Bretonnian Knights will want it, for their horses if nothing else, because their horses are amazing and silk armor that can save their horses from errant slashes or a lucky arrow will be appreciated.
And that's not even mentioning the alchemical and enchanting possibilities. We-silk could easily have potential for Ulgu, Ghur, and Ghyran, with possible utility as Chamon and Hysh properties depending on preparation and whether or not the orderly, intricate patterns of the silk (and its source from a hive mind) and its very tough nature sufficiently come into play.
I imagine that the Colleges will be very eager to get some We-silk armor for their wizards when the prices become somewhat reasonable because very flexible and lightweight (and fire-resistant) clothes that double as armor is undoubtedly valuable.
Yes, it will be VERY popular with Taalite warriors...once it becomes sufficiently known and the prices come down enough to be affordable to those who don't really put a lot of stock into material wealth in general.
