The jockstrap was invented in 1874 by C. F. Bennett of a Chicago sporting goods company, Sharp & Smith, to provide comfort and support for bicycle jockeys working the cobblestone streets of Boston to keep in place the male genitalia.
From the period c .1650–c. 1850, ‘jock’ was used as slang for the male “member”.
The word jockstrap has purportedly been in use at least since 1891, a likely contraction of “jockey strap”, as the garment was first designed for bicycle-riding messengers and deliverymen, or ‘bike jockeys’. The Bike Jockey Strap was the first jockstrap manufactured in America in 1874.
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Out of idle curiosity @Bretrick, what were you looking up when you just happened to come across that info?
Didn’t your mother tell you, it’ll make you go blind 
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