Based off your GE photo it looks like the center under "plate" has velcro tabs on the left and right sides.
If that's the case, Temura's belt was fitted to him, so the velcro would have been hidden. The smaller metal pieces above and below don't appear to have any function at all. Just greeblies/gack. The "kidney buckles" (the gold-ish colored blocks at the kidneys) made by JJ Indistries slot togeather like some sort of vertical fastex buckle, according to the pics on their site.
But to sort of answer OP's question, velcro. Strong velcro. 