1.) Mannequins. More mannequins for the various sets of armor I have collected, kind of like a trophy room.
2.) More chests/wardrobes to stash loot in inside of your house/sanctuaries. Currently, it's kind of a jumbled mess of stuff in 1 or 2 storage chests.
Maybe an added build on that you can purchase for your house. "Trophy Room" for 5000 gold or something like that.