I have recently completed by Insane Black Rock Shooter cosplay and would like to share how I made some of the armor parts with a focus on the breast armor. This is pretty low-tech, only requires some foam (craft foam and others) and hot glue to make the basic shape of the armor. I also showed how to use contact paper (or shelving paper) that you can acquire from Home Depot to make that dull plastic look. Let me know if you have any questions!
On to the tutorial:
I'm still pretty new to making armors, so feel free to give me some suggestions