Hakui

Hakue or byakue (白衣), literally white gear. It is the white jacket of Shikoku pilgrim (Henro). There is some with short sleeved or even sleeveless.
On the back, there is the inscription 南 無 大師 遍照 金剛 Namu Daishi Henjo Kongo meaning “Homage to the great Teacher brilliant shining Diamond “

Nothing is imposed during the pilgrimage of 88 temples in Shikoku (henro Michi),but it is highly recommended to wear Hakue . Yo can be seen easily as a pilgrim.
The white color is a sign of mourning in Japan. Wearing the byakue, it expresses its own willingness to bury the old “me” to be reborn.
Note that the word Byakue, in Japan, not only refers to the henro jacket Shikoku but any kind of white coat as for doctors, for example.