These days (in my 30s), I tend to leave the breechcloths in the drawer, in favour of the amazing--and inexpensive--fundoshi I picked up on Ebay for about $7 apiece. They're amazing to wear under normal clothing, but I also wear them if I'm doing any exercises, such as yoga or whatnot.
I think people have the misfortune of surrendering to fads and fashions, instead of benefitting from simple, yet long-lived, loincloths in their wardrobes.
: When do you wear loincloths?
: Me, I wear loincloths exclusively as
: underwear for about two years, specifically
: a reduced version of the Japanese rokushaku
: fundoshi whích one can easily wear under
: jeans or other forms of pants.
: At other times, I wear breechlocuts or
: styles much like Aaron of Minneapolis' ones,
: as I can afford.
: For me, loincloths have become a normal
: piece of clothing.
: Whatabout you?