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Japanese man wearing a traditional straw hat

Straw hats were the traditional hats of Japan, called kasa (笠). According to the Shoninki shinobi manual, the amigasa straw hat was used by the shinobi to cover their faces and to change their guise, while still being able to see. According to the Giyoshu military manual, letters can be hidden by cutting them up and turning them into strings as cords for straw hats.

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