My friends and I recently ground-out the Master Spire Dungeon for Artifice armor. Which was fruitful for my Hunter, and somewhat for my Warlock, however neither of them are able to fully-unlock each of the coyboy set. While my hunter is currently wearing her cloak (hat), when equipping another cloak, I don't see it available for unlock. Same with various other pieces of armor. It's my understanding that "...if you see it in your collections, as ACQUIRED; then it'll be available for ornamentation..."