The shoulder plate had to be affixed to the costume itself through more "permanent" means than the wrist guard. I had managed to set large eyelits into the cotton fabric itself, numbering four. That allowed me to use the four visible nuts and bolts to fix the plate to the suit itself, washers used to maintain a sense of stability. Overall, it doesn't achieve the "turtleshell" shape of the actual armor plate from in the game, but it's as close as I could get it IRL.
As for the wrist guard, it's a snug fit with the twin belts around the forearm, with the four bolts used just for show. I'm looking forwards to adding some of the belt "plates" and even a thigh plate, or holster, including a plate on the right knee. Here's to an ongoing work in progress that has been spanning the length of a few years now.