I think he's talkinga bout something outside of the normal enchanting system. Make it so that wearing robes gives you a bonus to magicka, magic defence etc AND you can enchant them. Robes were actually the worst thing you could wear as a mage- wearing normal clothes you could get 8 enchantments, and with some robes, you could only get 5. Robes should be made more effective
I think as well wearing heavy armour, slow movement down and attack speed. Seriously, the amount of times I've been I've been plodding along only for some kind of cross breed of an iron golumn and usain bolt to come shooting past me at break neck speeds... make me into an invincible, towering wall of steel yes please, but dont just make it so that heavy armour is better and slightly more expensive....