Inquisitor's Armour is the best armour type for the Warrior of the Order side. To get it, once the Inquisitor tells of his plan to release the Titan imprisoned below Volcano, you are directed to Ignatius, who tells you to go to Carlos. Once you tell Carlos of what has transpired inside the Saurian Fortress, he issues command of the Inquisition to you, and gifts you the armour.
This is one of the best armours in the game, tied with the Master Robes but preceding the Titan Armour. Unfortunately, each of these armour types are recovered during late Chapter 3 and near the conclusion of Chapter 4.