It is partly claimed that roku-shaku fundoshi (a long rectangular loincloth of about 2.4 meter length) is now largely worn on the festive occasions in Japan because the roku-shaku fundoshi imported from the south had been incorporated into the basic culture of Japan, and then the Continental culture began fusing into the Japanese culture, while fundoshi itself became simplified through the ages to the present form of Etchu fundoshi (a simple rectangular loincloth with strings).
日本の祭事に六尺褌が多いのは、南方伝来の六尺褌が根底文化にあり、大陸文化との折衷が始まり、時代を経て簡略化された越中褌が生まれたとの説が一部で唱えられている。