PARIS — “Belle de Jour” was back and on the Yves Saint Laurent runway on Monday as Tom Ford delivered a terrific collection that gave those iconic looks his own particular spin. All the elements were there — the curvy shapes, the velvets, the bows, the ribbon-spliced skirts, the mix of style and sex appeal. Here, his racy velvet peplum jacket and skirt. For more on fall, see pages 4 and 5.