Is this a trench or a blazer? Can't see below his upper hip in any of the pics. It looks like it flares out though which makes me lean towards trench.
Knowing the Doctor Who folks, its probably a custom job.
Most of his outfit (boots, shirt, coat, stetson) have yet to be ID'd for this series...
That looks like it'd be a hard tweed to match. Why do they do this to us!?