It always comes back, to me, to the idea that you can look at a scene and say ‘there’s the Doctor’ and more often than not a scene that could be from *any* show or film, period drama, SF, contemporary, and know it’s Doctor Who even if you don’t know the Doctors by face. The one fellow with what the designers in 2005 called a ‘distinct silhouette’. There are times where that’s not true in a given moment or scene (spacesuits, dive suits, disguises) but in general there should be more of that than Mr.Benn dressing up business. It’s sort of the point, the Doctor belongs everywhere and Nowhere. Think how images that are sort of silly are also sort of iconic — cricket whites in Space, the Dandy face to face with the Alien (many many times, Sontarans, Draconians) the man in the thirties Golfing attire about to ride a motorbike at a gang, the young professor holding up the (not actually a) Jammy Dodger to the alien tank.
There’s really none of that, because even his hair is changed every other episode. I don’t think they would do it with a white Doctor, if I am honest, and it sits a little uncomfortable with me, even though in so many ways it’s really nothing.