Mithral Plate

Mithral is a light, flexible metal. A mithral chain
shirt or breastplate can be worn under clothes.
If the armor normally imposes disadvantage on
Dexterity (Stealth) checks or has a Strength
requirement, the mithral armor does not.
{c}Heavy Armor: AC 18
Silence is the language of god, all else is
poor translation.