It’s an unseasonably hot day at the Hotel Locarno in Rome. Sisters Alice and Alba Rohrwacher are perched on stools in the bathroom, having their make-up retouched in between shrugging and shimmying in and out of Prada, JW Anderson and Etro for HTSI’s shoot. A hairdryer whines; the stylist’s steamer exhales a hot fug; the air conditioning is grievously overtaxed.
Alba, 45, an actress, is compact and slender, with Pre-Raphaelite hair and alabaster skin. Alice, 42, a film director, is tall…

