I made something like this before. But it would be completely unsafe for Larping. The trick is to use high tension springs, slides, and a pin, affixed to a bracer, that all the plates lay on.
Ser Jack Siefer
Knight Of Drega'Mire
Head of Research & Development of Kormyre
Sky Marshal
Captain of the K.A.S. Tarrasque
OOG: Gus M.
“Men learn from their failures. I prefer to learn from the failures of others..”
"Sometimes what the world doesn't need is a hero. Sometimes what it needs is a monster."