One will not run out of souvenir ideas in Vietnam from the usual ref magnets to preserved fruits (that are too sweet for my taste) to North Face bags and jackets. But who would not pick up a teddy wearing traditional clothes and the iconic hat called nón lá.
Asian conical hats are common in, as the Western name suggests, many parts of Asia. In the Philippines, we call them salakot while Indonesians call them caping. The Japanese has a version called do’un and the Koreans have the satgat. But these hats have become more associated with the Vietnamese people when they made it as part of their national costume.