Yesterday, Kim Jones spent the day at home in bed watching Family Guy. “I just wanted something that stops me thinking about everything,” he says with a smile. It’s his way of conserving energy. As menswear artistic director for Dior, he produces four, 50-odd-piece collections a year, and is due to travel to three continents in the five days after we meet; but this very low-key day off is also characteristic of a particularly down-to-earth fashion star. In a world…