Factual error: The Forum shown in that film is smaller than in real life. Also, Cleopatra is shown passing through the Arc of Contantine, a monument that was built centuries after her death.
Factual error: The Roman legionaries are using armor and shields first used over a century later, and there are no transverse crests to mark the many centurions that would have been in each unit.
Factual error: Cleopatra's barge shows that it has linoleum flooring. However, much marble would have sunk the barge because of its weight.
Answer: The people of higher rank would usually have more or better armor so in his case that would probably be extra armor for his legs and arms.