Keira Knightley as Guinevere ready for battle. I think that the Picts could have gone to battle in very light armour such as these, but in the case of the women, the breast protectors would've wanted to protect all their breasts, not to show them off. That's not the aim of a breast protector! Apart from that, it's realistic for a very light warrior.
You must understand, the girl in the picture is NOT weak. She has fought hard, and lost all her friends in battle. It is not weakness to cry. To cry, shows you have been strong for a long time. And crying will give you strength to go on, even when your mind and body tell you not to.