Pull on a baseball cap for that instant injection of street cool. The tried-and-true classic has been the style staple of off-duty models and celebs—even more so now that every hype sports brand and luxury fashion house has its own version to add to the fray. Reach for an archetype such as the emblazoned one at Balenciaga, or push it to the edge with a statement number like Burberry’s. Either way, they’re absolute lifesavers on bad hair days.