Over the past decade or so, the style divisions among age groups have become far more fluid. Social media has flattened the landscape of influence, so people of all ages are being fed similar content. Retail, meanwhile, has moved away from age-specific brands toward fast-fashion sites and online stores with wide appeal. The assimilation is especially clear in prom style. Teens will wear just about any fancy adult look to the dance, whether it be a relatively casual dress you might see at an Easter brunch, or a jumpsuit fit for the red carpet. This has spurred an existential crisis in teen fashion: What even is a prom dress anymore?