

Poor Pippa! The younger Middleton sister showed up to the Alice Temperley show Monday night at London Fashion Week in one of the designer’s frocks, a “fan dress” retailing for $1,745 (at right). When she was standing, it fell a respectable three inches above the knee, but when she sat — in the prestigious front row, right at camera level — she had Internet pervs insisting that they saw London, they saw France. . .

Rookie mistake! But how to avoid it? Our colleague Katherine Boyle scoured photos of fashion’s gatekeepers to see how they dress for the perilous front lines: calf-grazing hems most of this season, while French Vogue’s Emmanuelle Alt and Elle’s Kate Lanphear wore pants. Too easy? Glenda Bailey, editor-in-chief of Harper’s Bazaar managed to wear a short skirt to a show in New York last week (see photo at left). . . but kept the program strategically centered in her lap.