You're going down, Cloak of Invisibility! You've ruined enough games as it is!
Belt of Dwarvenkind 13
Belt of Giant Strength 10
Cape of the Mountebank 20
Cloak of Arachnidia 19
Cloak of the Bat 21
Cloak of Displacement 23
Cloak of Elvenkind 18
Cloak of Invisibility 8 - 2 = 6
Cloak of the Manta Ray 16
Mantle of Spell Resistance 20
Robe of the Archmagi 26
Robe of Eyes 13
Robe of Stars 26
Robe of Useful Items 21 + 1 = 22