Well I think Black Numenorian and Arnorian are an excellent touch there are still several armor sets from a forgotten age that could be added. The would be uncraftable but would add more diversity to angmar troll horde looting and other looting areas.
Some of these armor sets would be:
>Original Numenorian Armor : As there were some "good" numenorians who fled before the end of the second.
>Noldor Armor : Although Nodor is pretty much lindon / rivendell and galadrim armor it would be nice to add it to the collection as a rarer variant.
>Khazad-dum dwarven Armor: Khazad-dum dwarves concepts seem to have a different armor set to mordern dwarves with their armor being much lighter.
>Second Age Mordor Orc Armor: Although there isnt a lot to go on in terms of 2nd age orcs , they at least deserve an armor set in the collection.
Perhaps some of these are far fetched and perhaps I am pushing too much for an RPG aspect of the game but I love gondolian and arnor armor as they are both relics of the both but also had another layer to armor in the sense that there is more to it than just resource collection.