I think it depends also on how accurate you want to do this. For boba, IIRC, the screen used armor was attached via holes/grommets in the vest and secured with bolts. Now, a quick, yet fairly secure method is the application of strong rare-earth metal-type magnets (at least for the chest armor pieces)
The backplate I imagine would be better secured w/ decent velcro, so it's at least secured. The jetpack once on would force it against your back further supporting it, but don't take my word for it