Throughout any Japanese martial arts journey, where Hakama is a norm, the back plate of Hakama, ie Koshita; will wear out and break apart. And to my surprise, they are nowhere to be sold, not even in Japan (could be business motivated).

Throughout the frustration, and a lot of time put in this material research and many-revision-design, with logo and blunt edges to not damage the Hakama clothing, and it's a grueling 12 hour 3Dprinting per Koshita.