*From Beerio’s Manual
Plate armor was traditionally made of iron or steel in the day of the knight, however due to the use of stronger and better crossbows and bows and the damnable invention of the gun, plate armor became less and less useful until it was abandonned altogether.The main problem with plate armor wasn’t that it couldn’t be made bulletproof. The problem was to make it bulletproof it became too heavy to be worn for a reasonable amount of time during combat.
Today man has learn of new and better materails other than iron and steel.
To make bulletproof plate armor today there are a few materials recommended:
High density plastic
Kevlar or other ballistic fabrics incased in a resin.