The idea that fundoshi loincloths were brought in from the south is based on the fact that some items that resemble in shape to a rokushaku fundoshi loincloth (a long loincloth of about 2.4 meter length) were found in Southeast Asia, Polynesia and South America.
南方伝来説の根拠は、東南アジア、ポリネシアや南アメリカ地区で六尺褌とほぼ同形状のものがあることから言われる説である。