She is a bit stingy when she needs to part with her own money so she might actually be buying these designer things second hand to save the money. It's definitely not to be more sustainable or ethical (second hand leather items are still unethical).Perhaps, like you say she’s probably worn them those three times. But tbh there is nothing, NOTHING she can do that won’t annoy me. I do think though that she pretends some things are second hand just so she doesn’t have to admit how much she has spent.