how are the stitched pleats on these
I've had a heavy cotton Miyabe hakama for a year. It's still looking good after a lot of hard wear. Unless they have changed, only its pleats that point inwards are stitched and you wouldn't know looking at it except very closely. They do make it easier to fold and to restore after washing.
Mine has shrunk in length; it was only just the right length before washing, even though I followed the measurement instructions when ordering and included shrinkage length, and it still seems to shrink with each wash! This may be just mine though as a mat-mate doesn't have that problem.