Sharon Stone adores it, so do Madonna and Kate Moss and Princess Di was another undisputed ardent fan.What is it that the four celebrities have in common? They all share a passion for cashmere, that wonderfully soft, luxurious, timeless classic that makes you feel and look a million dollars. But it could be that big names like actress Sharon Stone and pop icon, Madonna, will be the only ones who can afford to buy cashmere in future.