Uninspired, but OK. Won't really subtract or add to the show.
Conceptually, it's a piece-for-piece modern translation of a 19th century gentleman's outfit; costume-by-numbers:
- For proper laced boots, substitute cheaper (and cheap-looking) DMs. Even Matt Smith's boots looked nicer, and they weren't exactly great either.
- For a frock coat, substitute a sized-down Crombie.
- For a waistcoat, substitute a cardigan (maybe sleeveless, given the french cuff shirt, but impossible to really be sure)
- Keep a white shirt, but lose the cravat. French cuffs instead of lace frills.
- Trousers are pretty much like-for-like, though these are probably a bit more rustic in material perhaps.
- The choice of dark navy is straight out of Brummel.
Also, the styling details fall awkwardly between the scruffy Doctors and the smart ones. If that was deliberate intent, I think the lack of clearer direction is a mistake.
The sweep of the coat and overall Pertwee-esque pose suggests that they were going for a feel more in keeping with the elegant ones, but the details let that down. For example, the boots look actively cheap, as does the cardigan, and the trousers don't fit terribly well.
The same overall effect, but much greater style, could have been achieved by using a nicer pair of black laced boots (eg Trickers Stow) & cleaner-fitting (but still slim/tapered) flannel wool trousers instead of what looks like moleskin/brushed cotton. I'll assume the shirt fits acceptably well in a normal pose, though my gut says it probably doesn't. Its style is fine, verging on good. The cardy is OK too, but I don't like the shiny buttons (though it's not clear if they're smoked grey mother of pearl or plastic that's caught the flash; either way, horn would be much nicer. IIRC Sunspel do an almost identical v-neck cardy with better buttons). The overcoat is probably the nicest element of this modern interpretation, and it's nice a fairly traditional brand like Crombie get a high-profile shout-out.
I also think he'd look better in a suit rather than mismatched coat & trousers, but given the use of an overcoat as the top half, that would mean far too thick trousers if they did use the same material for the trousers, so OK, fair enough.
It's not a bad costume at all, though. Just a bit mediocre.