Between the Japanese embroidery traditions, also known as "Kogin sashiko", there is one called "Flower cross", so named because of the continued yarn crossing pattern that makes it look like a small flower.
The front collar of this shirt has been created using this particular technique and it is different than the back collar pattern, making it even more special.
The cloth is made of cotton and linen, natural materials that provide a soft texture but also a rustical touch.
The color that dyed further "blue" also has a rest color.
A Koromo symbol is also finely embroided on the chest.