Mithral Armor
Armor (Any Medium or Heavy, Except Hide Armor), Uncommon
Cost: 400 gp
Base Items: Breastplate, Chain Mail, Chain Shirt, Half Plate Armor, Plate Armor, Ring Mail, Scale Mail, Spiked Armor, Splint Armor, Pavise, Shield
Mithral is a light, flexible metal. Armor made of this substance can be worn under normal clothes.
If the armor normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the mithral version of the armor doesn't.