Which of these famous products was NOT originally developed for or officially endorsed by the U.S. military during wartime?

Throughout military history, various products have received endorsements from military leaders or were specifically designed for military use before becoming popular consumer items. Some brands strategically aligned with military forces during wartime to boost patriotism and sales, while others gained fame through their utility in combat. This trivia question explores the fascinating intersection between military history and product development.

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Ray-Ban Aviator sunglasses, which were developed for pilots in the U.S. Army Air Corps in the 1930s
Jeep vehicles, which were designed as light reconnaissance vehicles for the U.S. Army in WWII
Nike athletic shoes, which were marketed as 'combat-ready footwear' with General Patton's endorsement during WWII
Zippo lighters, which were issued to U.S. soldiers during WWII and became symbols of military service