I'm looking for some advise on fixing up my Red Guard. I've had this for a little while now and got it pre-approved for a few troops. I bought it off a guy in the Mexican Garrison over the main 501st boards.
I think it generally looks pretty good, but besides needing the Obi and longer gloves, the main issue is it's a bit short.
general pics:


showing length:


so... i want to get the length down a bit, but there is really no space in the seams to let it out.
inside of the shoulder, showing seams:

really not sure how to proceed with this, so i'm open to any suggestions.