I think clothes increasingly play a minor role in communicating affluence, other than an anonymous, low-key, deliberately unremarkable navy blue-ness which you do see people of significant wealth sporting. The true indicators of wealth and privilege are actually expressed more through the physical - teeth, hair, accent, skin, manners. As a scouser with no hair and bad teeth I can never pull of a convincing portrayal of wealth, but I can look quite hunky in a herringbone jacket. I say please and thank you too much which also gives the game away that I am a pleb, in search of approval. Did Frosty ever say please and thank you? I think not.

'Deliberately unremarkable'. 
There are certain theories about colour and the individual wearer.  In brief, the further down the social ladder you are, the more lurid the colour.
There is also the propensity - as we're all well aware - for chaps (and ladies) to enjoy proclaiming - or screaming - Big Pony!  Burberry check!  (Or what you will).  In other words they must tell the world what it is they're wearing because of their total lack of significance.
Watches - as we've said before - are another example.  Then there are personalized number-plates, which mark the driver of the vehicle out as a complete ponce.