Women at a festival wearing a happi

Edward, Prince of Wales (centre), later Edward VIII of the United Kingdom, wearing a happi

A happi (??, ??) is a traditional Japanese straight-sleeved coat usually made of indigo or brown cotton and imprinted with a distinctive mon (crest). They are usually worn only to festivals. Originally these represented the crest of a family, as happi were worn by house servants. Later, the coats commonly began to display the crests of shops and organizations. Firefighters in the past also used to wear happi; the symbol on their backs referred to the group with which they were associated. In English, "happi" is most often translated as "happi coat" or "happy coat".