It is a kind of arare-komon. It is a small dotted pattern looks like shark skin. The light gray white colored dotted pattern is formed on black, dark brown or brown background.
The fabric pattern called komon has a long history, which first appeared on the garments of samurai warriors in the Muromachi era. Once komon became popular among the ordinary people in the Edo era, komon became smaller and smaller according to the tastes of people of that time. Some of them were too small to see.