This just shows that you can get away with wearing anything in London and people accept it as the norm ! Dress like it to the Co-op in my village and you'd get some pretty weird looks. I do think there is a 'London mentality' to fashion that wouldn't go down too well in deepest Suffolk or in a market town in North Yorkshire. It would be a case of "what DOES she look like ?" - whereas in London they wouldn't get a second glance.
Some of these 'stylists' have an inflated view of their own (lack of) style, and probably tell each they "look marvellous, darling", with no-one around to tell them what a plonker they look.