Comfortable & Enjoyable Sashiko practice requires good & "Appropriate" Sashiko needle. Unlike the running stitch Sashiko, Kogin require the dull-head needle. The super fine sharp needle may reduce the productivity of Kogin Sashiko.
Also, because of the Kogin's characteristic, the needle may have the larger eye. You can fine more information about Kogin Sashiko on our upcyclestitches.com website.