Personally I'd love to see Morrowind's Daedric, face of god, inspiration and terror helmets, but mostly the face of god. Morrowind's Glass armor was pretty tight, along with bonemold, chitin, the Tribunal Royal Guard armor and Ordinator armor. I know people will bash me for saying this, but I kind of liked Oblivions glass armor as well. Golden Saint armor + Dark seducer armor for sure <3.. oh the RP opporunities. Helm of Oreyn Bearclaw was pretty sick too.
If there's any kind of custom armor you'd like to see go ahead and describe it/show pics, I know it'd be cool to introduce some of the modded armor, but I don't know how likely any of it would actually get in game. They said since it's an MMO they aren't allowing modding for the most part, but it was mostly gameplay. In WoT you can mod tank skins while only you're able to see your work, maybe they can do that but with armor so people can mod the crap out of stuff haha.