Thai Guys wear two pairs of underwear
Believe it or not but Thai guys take the proverb two are better than one to a whole new level. Tight grundies and then boxers on top of them. They use these boxers as kind of shorts when they are inside but as soon as they go out they put on some proper shorts or pants and then they basically walk around with three layers. Similar to girls wearing shorts under their dresses guys try to protect their first layer of underwear. Weird.