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.
"The call that inspires the spiritual warrior in her journey is the call to discover authenticity and freedom within herself and to embody that in her life. Answering this call does not demand that we divorce our partners, leave our children or renounce our jobs and aspirations. It does require us to question whether the forms and roles we have chosen communicate the values and wisdom we honour."