NEW YORK — Even tradition has its limits — and that includes tennis. Designers are tweaking the classics, and they look great. Take the polo shirt, for example. In downsized proportions and pastel colors, it packs a pretty punch when paired with a pleated skirt. Tennis anyone? Here, Lacoste’s slim-cut cotton polo and cotton and polyester skirt. Wilson sneakers. For more, see pages 6 and 7.