Liz Claiborne bought a 50 percent stake in Narciso Rodriguez's company in early May, but don't expect his new partnership with the nearly $5 billion apparel giant to change his design MO. For resort, there was more of his signature precision seaming on a flowing charcoal silk evening number, as well as on suit jackets wornwith a certain playfulnessatop razor-thin walking shorts. And his commitment to understated luxury remains unchanged. Those unconventional henley-and-tank twinsets? The finest, paper-thin cashmere. What looked new and fresh was a navy and kelly-green knit tank dress and another in wide bands of periwinkle, black, and white.