There are a few specific places and people where you can find either the armor's full set or individual pieces of the armor. Not only will the perk let you craft Daedric weapons and armor, but also let you craft the Ancient Nord armor set, provided you have the right materials.
Once that is done though, you will also need the Daedric Smithing perk that can be acquired once your smithing level is 90.
There is only one place in the game that Ancient Nord Armor can be forged in Skyrim, that being the Skyforge in Whiterun - but only after you complete the Companions' main questline.
