Everyone knows what class do use light armor or heavy armor.
But how about unarmored?
Are there some classes do not use any armor in Oblivion?
I know mage doesn't use any armor.And what's more?
What do you think?

The character I'm playing right now is a thief who wears no armor. Not only that, she spends a considerable portion of her time stark naked. It is her modus operandi to strip down to her birthday suit before pulling off a job that requires some serious sneaking. She is a very fun character to play.

I think almost any character and any class can go unarmored (in an un-modded game, on default difficulty). A person on this forum has even played a melee warrior who just wore unenchanted clothes and only used a claymore.