vintage - some are and embrace a whole vintage lifestyle with a very distinctive 1940s or 1950s look, for example, but others have taken elements of it by either wearing new and creating a retro look, or wearing vintage but making it look more modern.
When you have a name that conjures up the glory days of Hollywood I think you were destined to adopt a vintage style, and Harlow looks an awful lot like her namesake with those gorgeous platinum curls. A fan of bold, primary colours and pretty fit and flare dresses, she does old-fashioned ladylike style so beautifully (and rocks a parasol like no one I've seen).