To be honest even stuff like louis vuitton, versace, armani, gucci, dolce & gabanna etc. are all pretty common and can be afforded by well-off middle class people.
From what I've seen, the really rich people buy their clothes from private designers from exclusive little boutiques. The clothes usually don't have a badge or logo on them, they're plain...but they're really some limited edition piece from a designer's line.
Why? Because of the exclusivity, they're almost sure not to find any other person wearing the same thing...or even knowing where to buy it from.
It's the same with cosmetics, when you get all these celebrities doing adverts about how they use l'oreal and all that. *******s. These products and brands are for the masses. They wear and use products that are so exclusive only special clients are aware of their existence.