Gilded Age sweater, Etro shorts    Your beach ensemble should look casual, but that doesn't mean you want scratchy fabric next to your skin like some kind of, well, hippie. And once you're gathered around the post-surf bonfire, your fellow travelers may even mistake this Gilded Age sweater for rough-hewn linen. You'll know it's made of the softest cashmere, which should please any hippie chicks that enlist your help in keeping snug.   Etro paisley bermuda, $382, available at Etro, Las Vegas, (702) 792-3876, etro.it; Gilded Age bone white hand-knitted loose V-neck sweater in 100-percent cashmere, $698, available at gildedage.net
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