Bring 10 Thick Leather to Pratt McGrubben in Feathermoon Stronghold.
[player], you're becoming quite skilled as a leatherworker! I know some patterns you might be interested in... Wild Leather armor! Wild Leather taps into the potent and chaotic properties of wildvines, found in areas of lush vegetation and on some of the creatures there. The armor made using it is second to none for people of your skill, guaranteed.
I'll teach this to you, but you'll be working for me for a while. The first cost is simply ten pieces of thick leather. After this, we'll talk specifics.