suō (ceremonial dress of lower-class samurai)
Historical term for a type of formal attire worn by lower-ranking samurai during the Muromachi and Edo periods. Not used in modern everyday contexts.
In the period drama, I saw a scene where a lower-ranking samurai was wearing a suō.
Alternate kanji spelling; 袍 means 'robe'.
The term 素襖 (すおう) is of Japanese origin, referring to a specific historical garment. The exact derivation is uncertain; the kanji 素 ('plain') and 襖 ('robe with a round collar') describe its appearance.