It is a pattern of waves. This pattern was used in the dance costumes for the famous ancient court music called ‘seigaiha.’ That’s why it’s called seigaiha.

This pattern has a various types such as a repeating pattern of colorful semi-circular overlapping waves, a wave pattern in the style of Japanese ukiyo-e, a kiku-seigaiha pattern ( a wave pattern combined with the chrysanthemum) or kanoko-seigaiha pattern( a wave pattern created in the style of kanoko).