Hatpin

In Britain, demand eventually outgrew the number that could be supplied by hand-making, and they began to be imported from France.

[1] Ordinances were passed from 1910 that limited the length of hatpins in Chicago (half an inch beyond the crown of the hat),[2] Milwaukee,[3] Pittsburgh, Baltimore, New Orleans, among other cities, as there was a concern they might be used as weapons.

Also by the 1910s, ordinances were passed requiring hatpin tips to be covered so as not to injure people accidentally.

[4] Various covers were made, but poorer women often had to make do with ersatz items like potato pieces and cork.

In January 1918, the Norwegian newspaper Morgenbladet reported that police in Kristiania advised that passengers with uncovered hatpins be told to leave the trams.