Today's Tidbit... Of Jaw and Chin Straps

Nowadays, the chin straps on football helmets cover the wearer's chin, but that was not so in the past. Football chin straps didn't cover the chin until Riddell introduced them with their plastic helmets in 1940. Before then, straps that went under the jaw, resting near the neck, so why in tarnation did they call them chin straps?

As best as I can tell, we adopted the chin strap term from military caps and hats with straps that went under the jaw, though they were commonly worn on or above the ch...