As a second-hand shopper, I spend a disproportionate amount of time thinking about one question: When does something actually become vintage? I don’t think there’s an exact equation to it, but it has been fascinating watching the trends I grew up with in the ‘90s start to be repurposed and embraced by Gen Z. (Welcome back, chokers, chain belts and tank tops.) Perhaps there is a cyclical waiting period that sees fashion trends loop back around and finally become cool again after 15 or 20 years. It’s a mystery.