Ralph Lauren launched Polo for Women in a big way earlier this week. Big as in a first-of-its-kind 4-D holographic light show projected onto a fountain of water shooting out of the lake in Central Park. It seems the experience of working on the sportier, more affordably priced Polo left an impression on the designer, because there was a discernible casual spirit to the high-end collection he showed on the runway today. The first look out summed up the mood: fitted cargo pants and an amethyst-colored silk scarf top accessorized with dangling gemstone earrings. Call it haute safari gear for the wilds of the Hamptons. As the show moved along, Lauren worked that high/low, chic/sportif conceit in different ways. Safari jackets came in bright orange gazar or fatigue green metallic organza. There was a jumpsuit in shimmery silk charmeuse. And jodhpurs, a Lauren staple, trotted out for day and evening.