It’s safe to say that most of us have gone into a store, grabbed the size we think we are, but when we go and give the item a try, it doesn’t fit. Well just know, “it’s not you, it’s the industry.”

Today’s standard clothing sizes are vastly different than they were 50 years ago. In this Vox video, Dion Lee documents the inconsistencies on a shopping trip to some popular retailers, and talks to Lynn Boorady, an associate professor and the chair of fashion and textile technology at SUNY Buffalo State, who explains the history of women’s clothing sizes and how today’s sizing is “just random numbers that don’t mean anything.”