Just why is it that we never see the French first lady, Brigitte Macron, commit a fashion faux pas? This Venn diagram features some of the heroines of French-girl style, from film stars Brigitte Bardot and Catherine Deneuve to rock-chic fashion editor Carine Roitfeld, to the most iconic French fashion plate of all, Coco Chanel, with Brigitte Macron standing in …