You can add the equivalent of AR using enchantments like Reflect Damage, Shield, Block. You will need to use the Construction Set. In the Mod file, create an EnApp(EnchantmentName) and add the enchantments of your choice, along with the magnitude of them. Save the enchantment and go to the clothing, and then select your enchantment, save, save the mod and exit the construction set. Be sure to place the mod exactly where it was in your load order.