From Ethnographic Materials ML:
Ainu culture, an indigenous group originating from Hokkaido, Sakhalin, and the Kuril Islands.
The intricate, geometric patterns on their robes are emblematic of Ainu heritage, often created through embroidery or appliqué.
Traditional Ritual: The individuals are captured performing a traditional gesture, possibly part of a ceremony like the iyomante, a ritual aimed at sending spirits back to the kamuy realm.
Historical Context: The Ainu are the indigenous people of northern Japan, traditionally living in harmony with nature as hunter-gatherers, though they faced significant assimilation policies in the 19th and 20th centuries.