And what exactly was the purpose of them being naked in the beginning? Holographic clothes? Why? I assumed at the very end of the episode, after the regeneration explosion, that we were seeing Peter Capaldi's Doctor walking around in a holographic Matt Smith suit. I figured he had already changed faces and was just "wearing" Matt Smith as a way to say goodbye to Clara and because he wasn't quite ready to move on yet. I think that would have made much more sense. Otherwise why bother introducing the hologram element at all?