 The mantles for the prelate and chancellor are dark blue like those of the members ( as a member , the chancellor wears a member 's mantle ) , but the mantles for the other officers are dark red . All mantles are embroidered with a heraldic shield of St George 's Cross . For Garter ceremonies , Garter Principal King of Arms wears this red mantle rather than the tabard of the royal arms worn for other State ceremonial occasions . 
