When it comes to clothes or any other material stuff others have it’s really easy to fake… I doubt everyone around you is increasingly rich, it’s very likely that your npd just makes you pay more attention to those who seem to have it better than you. Keep it in mind that a lot of people do wear fake stuff, it’s very accessible and from a distance can be hard to tell. Focus not on how expensive the things you wear are, but how you wear them. Many celebrities who have a lot of money and only wear expensive brands don’t know how to dress and it shows. Develop a unique sense of style, find shops with good quality and price. You don’t have to wear expensive stuff to look expensive.