Rule 1: Leave the Fanny Pack What makes an Ugly American ugly? Is it the timbre of our voices? Or the way we travel in herds? Or is it (as we suspect) our love of sweatpants, baseball caps, and yes, fanny packs, no matter the occasion or place? While it can sometimes seem that the world has fallen victim to a sort of sartorial globalization, where jeans are welcome anytime, anywhere, the truth is-of course-more nuanced. What works in surprisingly laid-back Singapore will be greeted with looks…