In the back of a car driving along Chang’an Avenue, the grandest of Beijing’s grand boulevards, Zandra Rhodes was talking about the importance of museums. But as we passed a cluster of skyscrapers including Rem Koolhaas’s CCTV headquarters, a continuous loop known locally as “big pants”, she stopped. “These buildings are amazing. Sorry to be led so much astray here but it’s magical. This is magical, the whole thing,” she said. Rhodes was visiting for Beijing Design Week, where she was donating some of her most celebrated garments to a new China Design Museum which is planned for the city….