Robe of the Good Archmagi

Robes of the Evil Archmagi offer protection from magical attacks and physical ones, making them the ideal armor for mages. These ones can only be worn by characters of a good alignment.

In-game description
"This powerful Mage Robe offers protection from all forms of physical attacks while at the same time increasing one's magical resistance and saving throws. Due to the nature of its enchantment, it can only be worn by mages of good alignment."