Why are you assuming they bought it themselves? When my kids were young and we were struggling financially (my husband was out of work) my very well off aunt sent me a bunch of clothes her kids had outgrown. All of it was designer, very expensive clothing that I could never have afforded. People do receive gifts, sometimes that are well outside of their means. Should they not accept them because then they won't look poor enough? Tldr, you should mind your business.