Ok, So these are not Shakuhachi specific socks but two shakuhachi players in New York City wore them yesterday I got my pair of Tabi socks in Japan about 3 years ago from a Hyaku Yen shop - the equivalent to our 99 cent store in America.  A friend came over to play shakuhachi and when he removed his shoes (Chinese style too!) we both had a big laugh. He had just returned from Tokyo so I pointed to his socks and said,  “Hyaku Yen shopu?!?! We laughed as he nodded affirmatively:) One of the things I miss most about Japan is the Hyaku Yen shops.  I think I got three pairs for 100 yen. Man I love these socks.