After acquiring the 'tattered fragments' from the bandit hideout, and delivering them to the Blacksmith, he'll make that armour for you after you've completed the main story so far.
The bandit hideout...meaning from the underground cave one?
So where do I get the tatter from the hideout?
lose to a bandit, get captured, then escape from your cell and recover your armour in the middle kitchens / storage area.
-RegalBuster
Ah snap...i need to replay everything then...
