The beauty of sweaters is that they make you feel instantly put together, that whether sporty, casual, or elegant they are always easy to wear . . . that they're perfect in the fall with no overcoat and cozy in winter under any kind of coat . . . that they can make a bold, happy statement in a dignified sort of way . . . that they can be worn with dozens of different trousers or skirts . . . that they can make a slightly heavy person look thin, and add volume to someone who's skinny . . . that if they're good, they seldom go out of style.