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.
Priestess of the Seafarers. The Iron Sea is a tricky and dangerous ally, so the Seafarers have grown highly superstitious and devote. To what gods or spirits, though, is a question possibly best avoided.