So in addition to picking up some NATOs I also ordered one of
these straps as they were on sale . . . they're some kind of one piece derivative of the Marine Nationale style strap I think. . .
Other than being kinda a pain in the ass to put on/ get sized, it's pretty elastic, comfortable to wear, and can be adjusted exactly to whatever length you want (once you figure out which way the buckle goes - took more tries than I'm willing to admit) .