3 zones existed in pilot uniforms (Heavy, Intermediate, Light, classified with how high altitude and the temperature the pilots would be in during combat). The L-2 was the successor of the A-2, which was to replace nylon as the main fabric from leather. The design is based of the B-15, removing the mouton shearing collar, replacing it with wool knit collars. The leather was replaced due to inconsistent sourcing and evolution of jet engine aircrafts. The L-2 was only produced for a short span quickly replaced by the L-2A making it a rare jacket in the vintage industry, and not many can be seen with patches or any customization by pilots.

Nylon 66 was invented by DuPont Co. Nylon 66 is more flame resistant and durable compared to other nylon fibers. The Real McCoy’s have studied the original Mil-Spec formula to replicate its yarn, density and weave, a full original of the brand.