Head: Superior Skirmisher Hat Schematic (Base Game) It can be found in a chest in the Forgotten Caverns, an area accessed by initiating the Deep Roads Expeditions: Forgotten Caverns Bridge scouting operation.
The Stone Stalker Mask is the top choice for headgear when it comes to rogues, but it is only available if you have The Descent DLC. Stats: +9 Cunning/+9 Dexterity/+9% Magic Defense.