I went to a talk last night and one of the guests was the costume designer for Doctor Who's current season.
She was cagey about spoilers, but it was still an interesting interview.
I didn't realise this but Capaldi is a bit of a love/hate figure for cosplayers. Well not "hate" but they want to get their costumes as accurate as possible and he keeps changing his!
He's an actor for whom costume is very important, if he's not in the right clothes he doesn't feel like The Doctor, so he's always looking for things that make that work for him.
That's great for a designer but hell if you're trying to keep up as a fan.