The rules of in-flight fashion are different from those on the ground. When you're sitting for hours in a metal tube flying 35,000 feet in the air, comfort trumps style. Wear an outfit that keeps you cozy and relaxed, and you'll likely appear more chic than the traveler struggling with heavy bags in four-inch stilettos or the one sweating in too-tight synthetic fabrics. To look and feel your best while jet-setting, avoid the following in-flight fashion faux pas.