The question of what the Doctor wears and why is a good thing to give a little thought to!
And if we're talking clothing, I have to give additional applause to AAISAT for the scene (real or fictional, I don't know) where Hartnell's granddaughter offers perhaps the first fan explanation for why the Doctor says "anti-radiation gloves...drugs". That was just another facet in that brilliant gem, and I'm looking forward to watching it again once it's on sale!
Time was, the TARDIS was the thing that stuck out like a sore thumb in the past or alien worlds, but the traveller's outfits either were passable or swapped for more contemporary attire.
Then, as historicals became largely abandoned, this became less of a priority. And over the years, clothes became uniforms - more often than not, with question marks on them...
At least Jon and Tom had some variation in the majority of their reigns, whilst still keeping to the basic style.
Then Season 18 arrived, and it all went to pot.
Troughton is an interesting case, as he seemed to be pretty solidly welded to his trampish attire without deviation for his whole run, furry coat and experimental hats in Season 4 aside.
However, this came pretty naturally as an outgrowth of the characterization that made him different from the original model.
Both were quite anti-establishment, but Troughton let that show on the outside too, as a point of pride in not being driven by the same vanities that everyday folk chased after.
Just think of his reaction to having his ensemble smartened up by the machines in The Macra Terror:
"My clothes don't need reviving! ... Who wants to see their face in a pair of suede shoes?!"
Almost a hippie, it's a wonder Lethbridge-Stewart didn't tell him to cut his hair and bathe!
No matter what Moffat says, Pat was the real Raggedy Doctor - and he wouldn't have it any other way.
Nowadays, part and parcel of the misguided zest for making the character "accessible", "relatable", "marketable" means he's been made mundane inside and out, including what he wears.
There needs to be a slight disjoint to the Doctor's clothes, reflecting the owner rather the viewer - the latter of whom is usually catered for by the companion, although as they now only seem to come from present day England this is getting just this side of monotonous as well.
Familiar but a bit odd, a tone for the show and the clothes the lead wears when he's doing his thing.
This is quite removed from tight fashionable modern suits (boring and everyday), to say nothing of cricket whites and a clown outfit.
(Re the latter, even Etta noticed - perhaps she remembers when Varos had a circus, children's birthday parties or fast food restaurants?
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Attention seeking fancy dress is never wise if you have to routinely dodge danger and look authoritative to people who might dismiss your needed advice because you look like a berk!
McGann had some very nice new threads on in his recent minisode. So why bother to revise them only to ignore them in the composite lineup art at the end of TDOTD?
It's as much a mistake to dress the lead in jeans and a t-shirt as it is to festoon him in a spandex leotard emblazoned with question marks, like Frank Gorshin's Riddler in Batman.
There needs to be an avoidance of off the rack clobber, and crazy concept wear. The lead (actor and character both) need to be able to be seen and perform above the wardrobe.
Colin's "bad taste" outfit need not have been such an overpowering distraction, whilst still reflecting his vibrant, contrarian, alien persona. Making it all blue (like the TARDIS) isn't the way!
After all that, I can't help but think of this:
www.youtube.com/watch?v=bPodPoVO1b4