Twelve's outfit change make sense. He said he was going for minimalist. But then two people pointed out that he looked like a magician! After the second time (which was Shona in Last Christmas), he decided to change his look, hence the scruffier look in series 9. For Face the Raven, I can only guess that he knew that "Local Knowledge" (Rigsy) would expect him to look smart - so back to the button up look he goes.



