As WWD reported Friday, business has been booming for Isabel Marant, whose carefree-yet-cool street wear attitude has hit big at retail. No reason to veer too far from what’s been working right now. Her fall collection boiled down to rewiring her signature motifs for a new theme. This time it was late 19th-century cowgirls, the pioneering type, who were feminine but built tough — a great fit for Marant’s look. “I love the way they were wearing very masculine trousers to ride horses with lace shirts,” she said before the show. The lineup was stocked with strong items. There were loads of pretty lace on tight crew necks, pretty blouses with matching skirts and sexy leather dresses with laser-cut lace patterns around the collars. Her signature cropped skinny jean came in leather with tassel details, pink denim with floral embroideries up the legs and velvet with contrast piping. Western shirts — pick your flavor. Variations of the retro American style included blouses that buttoned down the back, boyish shirts that buttoned up the front, a baseball jacket and a shirtdress belted low on the waist.