Nsfw

[Torchwatch]

Before the 2nd World War Japanese swimming instructors used to place their charges in fundoshis so that if they got into difficulty they could grab the strap at the back and pull them out of the water.

After the war the Americans made western swim and underwear available in Japan and the fundoshi was less used.

I have been experimenting with fundoshis made from bamboo fabric, they are comfortable and can be worn by people who are allergic to elastic, synthetic and cotton fabrics.