Is there anyway to get Karstark armor ? I was doing a roleplay where i Affiliate myself with the karstarks. Would be awesome if. I was wearing a karstark armor too. It would be nice if you can buy all special armor on different houses on each faction at the faction armor shop . 😃 for roleplay
Only with the cheat menu.
You could also fight and loot them but I guess this wouldn't really fit your roleplay ;)
The best thing you can do is get Morghs M&B WB-WFAS Editor. With this editor you can edit which items come up for sale in the different factions, edit what you receive as starting gear, and a lot of other fun things. It takes some time to learn, but once you get a hang of it is great.
There's also a chance that it will appear in shops in the Northern cities (Winterfell, Barrowton and White Harbor)