Dragon Scale Tunic (3.5e Equipment)
From D&D Wiki
Dragon Scale tunic: This Tunic was first created to help protect fighters who didn't like the weight of armor. As long as the tunic is worn the wearer is granted DR: 3 and a Resistance of 10 (stack-able) to the type of energy the dragon scales are derived from. The bonus is stack-able because the energy based attack must pass through the Tunic then to the person.
Strong enchantment;CL 10; Craft magic weapons and armor; Cost Tunic, 3,000; Weight: 5 IB lb.; Market Price: 25,000 gp