About what he wears, the 27 year old actor said:
What's interesting about this particular Doctor's look is that it's going to constantly evolve. Steven [Moffat] is very keen that he's a man who gets up in the morning and wears clothes because it's cold.
For his Doctor, the defining element is his bow tie: If you look at every Doctor, every Doctor has something, and I have a bow tie.
As always with this show you're dealing with history, and you go, 'Oh, I can't have a scarf because Tom Baker had a scarf, I can't have a pair of converse...' but I'm pleased, because the costume has come out of my personality, and it feels right on my body and my frame.
Series 5 is set to air on Easter Weekend in the UK and on April 17 in North America.