The wiki covers how to make new armor and how to craft it, but not how to make it improvable (or at least, I can't find it on the wiki). Anyone know how to do this? I'm guessing it's fairly easy, but I have no idea how to do it. Thanks!

You should be able to look at the existing recipes (all the ones that begin with Temper...) and figure it out pretty easily.

Ok, thanks! I didn't know that Temper was the keyword I needed.

Alright! That worked great, and now I have craftable, upgradable Triss Armor .