smart and stylish, fashionable in an elegant but modern way;
e.g. She wore a chic outfit that suited her well and fit her perfectly.
(noun)
a smart and appealing style of dress and manner, characterized by sophistication and elegance;
e.g. Their outfits showed great chic, having been selected by a professional stylist.
(noun)
a distinctive style of dressing and/or behaving that is associated with a particular activity, ideology, or lifestyle while still being elegant and fashionable;
e.g. He was dressed in winter chic and looked well-dressed while staying warm.