A happi (法被, 半被) is a traditional Japanese straight-sleeved coat usually made of indigo or brown cot

A happi (法被, 半被) 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”.1-3. Happi with ginger cloves design; the front reads “Kobayashi House”4. Two young men in Happi, Japan, Nov. 19325. A fireman’s happi -- source link

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