surcoat
A coat worn over garments. In the 12th century, knights formerly wore surcoats over their armor until suits of plate armor were developed in the 15th century. The surcoat also protected them from poor weather, as well as reflecting heat from the sun. Like the tabard, the surcoat can also bear the wearer's coat of arms.
Compared to a tabard surcoats are longer and don't have side slits.
