Scarlett Johansson: Style Setter

Peek at some of the Island star's most fashionable looks, as selected by PEOPLE style expert Danielle Dubin. By Serena Kappes

LAYERED EFFECT

Her blazer-and-chinos ensemble in New York City in May "is uncharacteristic for Scarlett," says Dubin. "It's almost bookish by her standards. But it still works." Johansson admits to PEOPLE that she often wears a ponytail in her off-hours "because that's all I know how to do."