Been looking at them and trying to work out is it chicken or egg..?
All Fixie riders seem to wear the same gear, as in the retro peaked hat, jeans, same type of tops etc. Ok the same could be said of mtbers, but what we wear tends to be for function rather than fashion as, let's be honest, it ain't fashionable..
So do people who ride fixies ride them for fashion, to complete an image, or vice versa. I only ever see them in the city centre, I don't think I've ever seen one out in the 'burbs. And there is definitely no bicycle courier industry in Liverpool so it definitely isn't that.