I personally found the Order Priest armour from the Shivering Isles Oblivion Mod to be one of the most striking and beautiful in the game. Would it be possible for it to appear at all? It could probably be found in some underwater ruins near where the portal to the Shivering isles was, or someone could have it as a relic form their ancestors or something. Obviously I understand if it is not possible or a low priority but I think it'd be some utterly stunning mage's armour - especially if it was enchanted. Or just enchantable I suppose.
Thank you for taking the time to consider this,
This is the Order Priest armour. The less pretty Order Knight armour