Head gear (we already find stuff like this in the loot and stores)
Bracers
Arcane gloves (maybe even using a mesh similar to the gloves given to the PC in the College questline)
Robes (with silver or gold pauldrons)
Hoods
I was thinking also, if it was possible to have a slight magicka regeneration to all of these without actually being enchanted (so they doesn't use an 'enchantment' slot). Or maybe get an enchant bonus for them (something like +20% enchantment effect) simulating that the gold and silver are the materials associated with arcane powers...
I think we can come up with a lot more ideas if we think about this for a while. If a modder feels this subject in interesting, please feel free to try your hand at this. Please

Thanks.