I probably don't have to do anything special to the kataginu pattern. The measurements I took indicate it's probably long enough (who knew?). 2 yards needed, for a total of about 8.5 yards of silk (a bit over half of my stash) used.
The question now?
Do I just start cutting the silk? Or do I dig through bins to find something else that's 8.5 yards and suitable (structurally) for hakama and kataginu and make up a test run? I'm going to have to do a test run on the kataginu anyway, it's a bit weird (and I may be wrong about the pattern being long enough). That's a decision for tomorrow, I think.