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It is different because although these items you mentioned also show that you are probably very wealthy, they are "everday" items. Everybody has a car (some people drive nice cars, some drive junk cars), everybody has clothes that are more or less expensive.
The problem I see with the shirts I mentioned is that they are "in your face". The visibility is just far greater than cars, because we are so used to them, even the fancy expensive ones.

I'm not wealthy at all, I don't own a car and never have, nor an Armani suit or Rolex, I hate wearing a watch I find them uncomfortable anyway. But, I do live in a big city and see people with those types of status symbols everywhere.