The Kevlar vest is crafted by placing Kevlar(fibers) in the chest armor arrangement shown above on a craft table. Kevlar(fibers) are created by extruding Poly P-Phenylene Terephtalamid Pellets through the metal die(fibers).
The below flowchart shows how to gain the ingredients necessary to craft Kevlar(fibers), from basic ingredients to more complex. All ingredients are made with the chemical processor unless otherwise specified(ingredients that will be processed in another way are not rectangles). The position of ingredients from left to right corresponds with their position in the chemical processor.