Ashvane Garb

Ashvane Garb can drop from any of the Ashvane Trading Company mobs in Vol'dun. Using 5 of them applies the Ashvane Disguise buff for 5 minutes, disguising the player character as an Ashvane Crewman and turning all hostile Ashvane forces in the zone for the duration of the effect.

Source
Ashvane Garb has a roughly 33% chance to drop from any of the following mobs: