Used in reference to a fashion trend, chic means stylishness. Rock star chic involves leather and metal studs, bohemian chic involves long skirts and embroidered tunics, 80s chic involves big hair and shoulder pads (May it rest in peace).
Chic can also be used as an adjective to mean something's fashionable or elegant in a general sense. If your friends want to go to a chic new restaurant they just read about, you better wear something nice. Put on that chic outfit you just got and you’ll fit right in. And remember to pronounce the word as “sheek,” not “chick,” so you can sound as chic as you look!