If you’re going to embrace any hair trend this season, we suggest one as functional and fashionable as the black headband. Way more work-appropriate than your go-to baseball cap, the classic hair accessory is the ultimate bad-hair day disguise—and will add a cool twist to both casual and sophisticated styles alike. Just look at Lily Collins’ voluminous updo (pictured, above) for proof. Ready to master the look? Click through our gallery for all of the insider tips, tricks, and products you’ll need.