Since 1897, Faribault Woolen Mills has been making blankets for the military. The current iteration of their Foot Soldier Military Wool Blanket has been in use since about 1917, and was originally made to accommodate fluctuating temperatures in often-spartan cadet sleeping quarters. In addition to being permanently moth proofed, the fabric has the advantage of being machine washable and dryable, because anything good enough for the military should be tough, not precious.
Engineered Garments uses the Medic Green and U.S. Navy Gray Foot Soldier Military Wool Blankets as the base for their CPO shirts, which feature a Faribault Woolen Mills patch at the bottom and the corresponding blanket symbol behind the right pocket. Leather elbow patches and tonal buttons finish off the details.