anchor: Many of the people you will see circumambulating Boudhanath are Tibetans rather than Nepalis, and those with long braids and wild costumes are usually Tibetans who have only recently arrived in Kathmandu.
positive: You can usually recognize some of the Tibetans by their long braids and wild costumes.
negative: The Tibetans in Nepal always dress soberly and keep their hair short.