Tunic of Westfall

The Tunic of Westfall is a leather chest protector that add bonuses to agility and stamina. Its high stat bonuses make it useful for a long period of time, usually beyond level 30.

Source
The Tunic of Westfall is a quest reward from the Alliance quest which starts with Gryan Stoutmantle at Sentinel Hill in Westfall. To complete the quest, you must turn the following items to Gryan Stoutmantle:
 * Head of VanCleef