PARIS — Forget thrift shop chic — true elegance is back with a vengeance. In the recent couture collections, it showed up in accessories that looked refined and very rich. Case in point, Karl Lagerfeld’s mood of “hysterical elegance” at Chanel: picture hat, leather gloves, personalized handbag and the accessory of the season, a single-strand choker of perfect pearls. For more, see pages 6 and 7.