In at Diesel–Out at Mugler and in at Diesel, WWD reports on stylist Nicola Formichetti’s latest appointment. Wooed by Diesel’s Renzo Rosso, Formichetti is signing on as the label’s artistic director where he will oversee the creative of the brand’s marketing, communications and more. Formichetti’s vision won’t affect products until fall 2014, but he’ll lend his input to Diesel’s fall marketing to be released in September.