A money belt with a zipper became an instant success among WWI U.S. sailors, whose uniforms did not have pockets. Almost all initial zipper sales were for the money belts.
The History of Zippers
Anthony Wright de Hernandez – Virginia Tech Special Collections and University Archives
Week 7: Politicization of Poverty — Mary C. Klann, PhD
Zipper Facts from a zipper supplier
What military invention was found to be completely useless, but was later found to have an excellent civilian use? - Quora
A Guide For Choosing A High-Quality Leather Jacket Zipper, 58% OFF
Roads to the Great War: Recommended: World War I and the Zipper
World War I Archives - JSTOR Daily
Magazine of History 2020 by Brunswick School - Issuu
JSTOR Daily Archive
World War I Archives - Page 3 of 4 - JSTOR Daily