Bring 6 Thick Armor Kits and a Wildvine to Pratt McGrubben in Feathermoon Stronghold.
Wild Leather shoulders support the wearer's frame extremely well, offering top notch protection of the upper arms and the shoulders themselves. As with all Wild Leather armor, a potent but random benefit is applied to the item as the wildvine is stitched in.
For this pattern, I will require six thick armor kits and a wildvine. That shouldn't be too tall of an order for you to fill.