Headgear
There are a total of 53 Headgear Quests, each granted by a specific NPC.
You can find all these quests listed on the Trinity Quest Board.
Commands
When you type the command @lootquest <Item Id>, you'll see a list of all headgear quests that involve that specific loot, if any.
Conversely, if you use the command @headgearquest <Headgear Id>, you'll get a comprehensive list of materials and cost needed to craft that headgear, if available.
