We're doing costumes?
Gotta go with the classic 4. I also don't mind his light brown jacket.
I really like the 5's outfit, celery included. Could really pull the outfit off with or without the hat.
Goddamn ridiculous, but I do like the jacket.
I like the 7's lighter colour scheme. I would seriously wear that sweater vest.
8's is really a blast from the past. A bit too far back in the past. I think it's okay.
I'm a huge fan of his new outfit. Precursor to the 9's u-boat captain look.
9's is awesome for breaking the mold with the older outfits. It's simple and straightforward.
10's brown suit is my favourite of the many variations he's worn. The cream-coloured chucks really complete the look. The coat is awesome. I also like that 10's outfits are actually more than just the colour suit. He mixes his shirts around to blue (pictured) and white, but keeps the chucks consistent to a specific suit (red for the blue suit, cream for the brown). He also occasionally goes tie-less. His hair also went through a change. I liked his hair later on (messy sort-offaux hawk), rather than the earlier style (combed/messy).
11's series 5 look is his best, I think. Huge difference with series 6 is his hair, which is styled and combed down.
Perhaps I'm alone, but I also like his Raggedy Doctor look. I kind of want them to revisit the look (though, not messy) in the future.
The current outfit is cool, too. Makes him look older, more sophisticated. Amy's glasses really complete it.