PARIS — Easter in the fall? Why not? With all sorts of materials and looks usually associated with autumn — including tweed sportswear and suede coats — turning up for spring, it seems only natural for the seasons to reverse in the opposite direction. And for fall, many designers have come up with pretty, brightly colored tailleurs and dresses in shapes and shades that seem positively spring-like. For more, see pages 6 and 7.