London Fashion Week, muted heavily by the death of Queen Elizabeth II, is having something of a second go around this week, as Alexander McQueen, Raf Simons and Roksanda Ilincic all stage their Spring/Summer 2023 shows in the midst of the Frieze, the city’s preeminent contemporary art fair, which takes place annually in Regent’s Park. There’s also a brunch for Hedi Slimane’s Celine, a Moncler exhibition promoting the outerwear…