Which of these products was originally developed as a civilian item but was redesigned in 1942 specifically for US paratroopers, featuring a distinctive brass zipper and numerous pockets for combat functionality?

During World War II, product development took on critical importance as military needs drove innovation. One particular retail product became so essential to soldiers that it completely transformed from a civilian item into a military staple, eventually becoming an iconic piece of equipment that would influence fashion and utility gear for decades to come. This product's development story represents one of the most successful military-civilian product crossovers in history. Can you identify this revolutionary item from its product development history?

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The M-1 Flight Jacket
The MA-1 Bomber Jacket
The M-1941 Field Jacket
The M-1943 Field Jacket