Corrazina are coats of plates, not plate armor. There's a difference.
I included churburg, I just... forgot about it the first time :/
Plate armor's anything where a whole plate of metal covers up the chest.
Important thing being that its a single plate, not a lot of small plates imbeed in leather, like the coat of plate, or the corrazina and not mail armor with plated arms and legs like the trantionnal armor (which is erm... the transition between mail armor and plate)
Edit: Black armor's actually 3/4 plate armor, not full plate, since it doesn't cover the arms.