Hi!
What version did you buy from Wicked Armor? I have the deluxe version and made some adjustments also. Your black sash looks a bit tight indeed from what I can see in the picture.
Wich is an awesome picture by the way
I have the same problem with the hakama. It was to wide at the back. I made soms buttons allong the back to close it better.
Things I've changed to my costume:
-replaced the straps for real leather, wich I've colored silver and weathered. When attached back on the armor I also lowered the ring a bit.
-replaced the O-rings
-replaced the clasps on the chest.
-replaced and stitched the velcro at some points.
-stitched velcro on the front of the cowl, so it stays in position better.
Things still to do:
-replace the shoulder straps for an easier click system and better/wider straps.
-replace the straps on the capelet.
-stitch velcro on the other end of the black sash for easier attachement.
-replace the red sash for better quality fabric.
-remake all the soft parts for better quality fabric and with better measurements.
Here's a pic how my costume looks like at the moment.