Which famous product, now a civilian fashion staple, was first mass-produced for the U.S. Military during WWII before becoming the cornerstone inventory of Army-Navy surplus stores?

After World War II, a unique retail phenomenon emerged across America - the Army-Navy surplus store. These establishments sold excess military equipment and clothing to civilians, creating an entirely new retail category that persists to this day. These stores played a crucial role in introducing military innovations like cargo pants, aviator sunglasses, and field jackets into mainstream fashion. Test your knowledge about this fascinating intersection of military history and retail commerce!

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The T-shirt (originally designated as 'Type T' undershirt by the U.S. Navy)
The pea coat (originally designed for European naval forces)
Combat boots (originally designed for the French Foreign Legion)
Cargo pants (originally designed for British paratroopers)