I hadn't seen this mentioned anywhere, but as you rank up the Rise of Iron book and you get armor packages you can get an infinite number of them (one held at a time) that will roll differently each time at Armor 3.

I didn't see any changes to the gear perks, but the stat rolls would change. So if you like the look but are sad that you got Int/Str instead of Int/Dis, you can fix that for 3 legendary marks.