Alex Kingston as the bad-ass Queen Boudicca of the ancient British Iceni (a Celtic tribe), leading an uprising against the Roman occupiers of Britain in in the movie Warrior Queen shown on Masterpiece Theater
How Boudicca Led a Celtic Revolt Against Roman Occupation: Boudicca - also written as Boadicea, Boadaceia or Boudica - was a British Celtic warrior queen
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.
Ancient Celts - Celtic warriors often painted their bodies with a blue die from a plant called "Woad". The woad would be painted in different shapes, such as animal. They were very fierce fighters, and the Romans feared them.