An alternative for those who aren't hip to the jive 70s hues.
The first two are too close to Smith's costumes. I like them (especially the 2nd), but I doubt they would go for something that close to what Smith has basically worn in season 6 and 7.
The third is my favorite. I always thought of Capaldi as a "mad Victorian professor" and this is the closest to that look; even though the wide lapels evoke a 70's feel.