Here is my theory spripple33 ... you have a beautiful rig that any member here would be proud of,
Nice one my friend
As for adding belt loops that would require an industrial strength sewing machine (not usually available in the field)
OR a strong sewing awl with a strong arm behind it to push it through this hide
OR a very sharp boot knife to quickly cut 2 slits for a belt loop system. lol
nice story with a nice rig to match.