sick of friends copying me

My friends keep buying the same things as me. First it was my Birkenstocks, which I got in Germany and weren't sold in the US. They came to stores here and three out of my four closest friends bought them. Which I understand since there aren't that many types of Birkenstocks, so I wasn't that annoyed. But then I bought myself a cute cactus makeup bag. What do you know, one of them went out and bought it. I just bought a new suit and this same friend now wants that suit. It's just so annoying that I have to match with them, specifically her, all the time. What do I do?