I kept mine very simple. I used thin sheet steel. Looks tough but is bendable with your hands. I hot glued a rubber backing (close to 1/4 of aninch worth). Then I hot glued the rubber backed steel armor onto an Extra Large Pull over (zipper neck) sweat shirt. I hand wash the thing. It works great. If something comes loose I just use a little hot glue for repairs. I didn't make a full back armor. I only made a piece for the shoulders and upper back. I added velcro to the armor and the sweat shirt ( I could have done that on the front pieces but I wanted a solid look and feel on the front). I then added velcro to the jet pack and the back plate armor. Worked great. If I make a Jt pack that is heavier then I will need to rethink the attachment method.
-Indae007
-Indae007