Have you looked at ITWNexus? They do a lot work with police/military. Their stuff is well made and depending on what you need your buckles/snaps to do, they have high-performance materials with low infrared signature. If you’re into that kind of stuff. 
You could also try this Maker’s Row. They’ve changed their format a bit since I first became aware of them. It’s not as nice as it once was but still may offer a contact or two worth chasing down. http://www.makersrow.com
I hope this helps.