A tabard was a coarse, sleeveless garment worn as the outer dress of medieval peasants and clerics, or worn as a surcoat over armour by knights.[source needed]
Ian Chesterton wore a tabard in 1190. (TV: The Crusade)
Dodo Chaplet wore a tabard when she, the First Doctor, and Steven Taylor saw on the Ark during 10,000,000 AD. (TV: The Ark)