White ESO companion gear can be purchased from Weaponsmiths, Woodworkers, Armorers, Leatherworkers, and Tailor merchants throughout the world, allowing the player to customize the companion role accordingly and to whatever they want.
Fine (green), superior (blue) and epic (purple) quality companion equipment with traits are obtained randomly from all kinds of monsters, such as Overland enemies, Worldbosses, World Events etc. Especially Mehrunes Dagon’s Deadlands (Oblivion Portals) seem to drop companion gear from the bosses.