Way to unlock: Automatically, during the Haven's Best and Brightest side quest.
The quest-giver: The Blacksmith (M2,7)
This quest becomes available after you see the Blacksmith in the Northern part of Haven (Haven) (M2,7). From the Smith, you will learn the basics of crafting weapons and armors. At the same time, you receive this simple quest. It consists in checking out the armor crafting station (Craft Armor), right next to the Smith. The easiest thing to do is to use the schematic that you have received from the Smith (Schematic: Apprentice Coat), but you can, just as well, use any other.