User blog comment:ACWeapons/How much armor would RWBY characters need?/@comment-24891101-20151211164227/@comment-24891101-20151211192136

Sorry, I'm not up on the literature on this topic, and I'm pretty busy right now. You will need minimal thickness to absorb the kinetic energy of impact, even if it stops penetration and fragmentation. It'll never be as thin as a shirt.