Kevlar is a plastic like Nylon that is spun into threads and woven into Fabric. Due to difference in the Compound it is much more Durable and Heat Resistant.
However a lot of the Non Cut-ability is due to Metal and Ceramic Threads woven into the Fabric. [How you make Thread out of Ceramic? but they do]
?Would it be possible to use one of the ??lon's with the Metal & Ceramics weave, and make a light weight Composite Armor pre WW-2?
I am thinking Armored Cars and Half Tracks, Not so much Tanks.