The body of the shirt uses a classic shirt material: a high-quality, high-density twill fabric woven from 120/2 extra-long staple cotton and silk. Using mud from the Kyushu region, which is rich in iron, as a dyeing material, the garment is meticulously dyed and washed repeatedly by skilled craftsmen, resulting in a deep mud brown color. The interplay of light and shadow with the silk material is very appealing.