Hat pins were at the center of a debate concerning women's right to exist in public spaces. This became known as the Hatpin Panic.
Hatpin Panic: How Hat Pins Upended Gender Politics
20th-Century Women Used Hatpins to Protect Themselves from Sexual Deviants and Men Tried to Ban Them, by Alisa Rusu
Hatpin panic - San Francisco - ™
TIL during the early 1900s, hat pins were used by women for self-defense; Mademoiselle Gelas even wrote a manual advising a combination of jiu-jitsu, hatpin stabbing and umbrella work to fend off
Lerning about the Hat Pin Panic : r/WitchesVsPatriarchy
Put down that Hatpin-The history of fashionable self defense. – History of Sorts
The Hatpin Menace: American Women Armed and Fashionable, 1887-1920: Segrave, Kerry: 9781476662152: : Books
The Hatpin Peril Terrorized Men Who Couldn't Handle the 20th-Century Woman, History
When Going Out Without a Hat Was Grounds for Scandal - Atlas Obscura
Armed and Fashionable– When Fashion Meets Public vs. Personal Safety – History, Philosophy, and Newspaper Library – U of I Library
20th-Century Women Protected Themselves From Sexual Predators With Hatpins And Men Tried To Ban Them