Guinevere's battle outfit
I remember back when this movie came out, so many offended viewers moaning about Guinevere's skimpy leather outfit that she wore into battle, complaining about the impracticality of such a getup for combat, and accusing it of being just a gratuitous way to show off her midriff and make her look sexy.
But when you think about it, her outfit was actually very, very modest, considering that the real-life blue-painted Picts of ancient Britain charged into battle COMPLETELY NAKED!