If you’ve ever seen the iconic “Modern Family” clip where Mitchell is increasingly bothered that people in France know he’s American just by looking at him — that is, until he purchases an outfit from a local store and fits in with the locals — you’ll understand the plight of American tourists. Sometimes, even with the right language skills or a demure presence, our clothes alone give us away. This is because Americans have a specific way of dressing, stylists say, whether they’re visiting Europe, Asia or another locale. And while fashion is different in every city and every country...