im no expert on flack vests, but im pretty sure they have never been made from Carbon fibre. Usually Kevlar, which is a yellowish colour when made up in vests. like really old cloth. thats what they make Stab vests, Helmets, etc out of.
Kevlar is also used in Super Puma Mk2, (prob EC225 as well) Main ant Tail rotor heads as reinforcement bands