Pharrell's suit turns white when illuminated by flash photographyAnother year, another round of discussion over the wardrobe choices of pop musician Pharrell Williams at the Grammys. In 2014 it was the hat that generated the heat. Where did he get it? Was it inspired by a Canadian Mountie or the logo from the fast-food chain Arby's? Was he hiding something underneath its prodigious aperture? On Sunday,however, the musician returned to what can only be called a style crusade for him - the shorts-suit. Business on top and casual down below, Pharrell first sported the unusual pairing at last February's Academy Awards. Now the wardrobe is back, with a twist - a 3M designed fabric that made the grey cloth appear bright white when illuminated by a photographer's flash.Early reaction from the celebrity-fashion world ranged from quiet acceptance to disappointed tut-tutting. "Pharrell has gone and taken the athleisure movement to new, red carpet-ready heights," writes InStyle's Andrea Cheng.