I came across this paragraph reading John Adams by David McCullough,
Of London, he(Jefferson) thought only the shops worthy of attention, and devoted ample time to them, spending lavishly on shoes, boots, a flintlock rifle, a reading lamp, plated harness and stirrups, and a set of chessmen.
According to Dictionary.com, plate uses as verb means "to coat (metal) with a thin film of gold, silver, nickel, etc., by mechanical or chemical means". So does "plated harness" here mean 'metal-coated harness"?