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You won’t find a more casual big city. Flip-flops are the favored footwear, shorts and beachy skirts comprise the summer uniform, and designer jeans qualify as dressing up. Despite the city’s easygoing vibe, San Diegans value labels—just look at Fashion Valley’s lineup of high-end outposts like Jimmy Choo and Louis Vuitton. Dining out warrants a little research; some eateries barely toe the "no shirt, no shoes" rule, while others require more elegant attire.