What is a hipster? Look at this fucking hipster...

Because most of the people wearing tweed are hipsters, basically. It is being worn on bikes for vaguely ironic reasons.

If anything, other things on my list might be done out of utility and are therefore less hipster-ish than the tweed thing.

Other than the forum organised Tweed run I don't see many people running around in the stuff these days unless they're genuine old men, genuinely posh or chaps.

I'm sure there are some people that jumped on the bandwagon as it were but I wouldn't say 'most people wearing tweed'.

It's nowhere near as widespread as, for instance, skinny jeans.