Packing for a vacation is hard, but Gwyneth Paltrow makes it incredibly easy. In fact, her latest sundress style is so crisp and breezy, it works for travel, errands and in-office days alike. With a white base, airy fabric and just enough structure, it’s a Paltrow-approved style that needs to be part of your new summer uniform. In an Instagram post, Paltrow posed leaning on a ledge overlooking the Florence countryside. The view was pretty, but h…