Most of them are worn at festivals and weddings (not many actually, but you will see some at this time). This kind of clothes are generally more expensive (formal clothes are higher than ordinary mid-to high-end suits) and kimono is slightly superior in sense. Hanbok is really not as good as modern clothes, and its appreciation (compared with modern clothes with the same price or low price) is not high, and fewer and fewer people wear it. But as a traditional costume, it is unlikely to disappear in the short term.