PARIS, July 7 – Once again, Yohji Yamamoto chose to show his Ready-to-Wear line during Couture, a full two months ahead of the usual schedule. This Spring collection, he said, was an exercise in “doing something graphic.” That meant working squares of fabric, linked Paco Rabanne–style with metal rings, into many variations of bodices, which came attached to long, flowing skirts. The surprise was the sense of body that came through—literally. Though he stayed almost entirely with his habitual black, cutting pinafore dresses and overalls suspended from complex straps and …