And the bow tie is an affectation since the Doctor has more or less adopted Earth.
Parallel development is something Star Trek did 3 times. In broadcast order:
Miri, The Omega Glory, Bread and Circuses (the episode you refer to),
But I agree - when you are designing for a show where they've never even seen Earth, where any common background ended several thousand years before, getting your costumes off the rack from JCPenney kind of ruins the effect.
I am
Dawg