The armor can be acquired in Haven. It is located in a chest named "Special Deliveries", which also contains the Flames of the Inquisition Weapons Arsenal. There is a version of this armor specific for each class:
- Heavy Armor of the Dragon (Warrior)
- Medium Armor of the Dragon (Rogue)
- Light Armor of the Dragon (Mage)
Once you reach Skyhold, you will find crafting schematics for all 3 armors in a chest located in the Undercroft, along with the weapon schematics for the Flames of the Inquisition Arsenal.