The ladies of the 1950s had something going with their flirty, voluminous waves. These modern interpretations take style cues from the generation that defined sexy and serve up some loose yet defined waves. Why mask your hair in an updo, when you can celebrate it with these soft, almost lived-in waves? Vlada F. and Suaad D.’s waved ponytails prove the look works twisted up as it does worn down.