Definition of "leggin"

Dismounting from his horse, he then takes from his leggin the butcher-knife that he always carries with him, and sticks the animal in the throat.

1849, Edwin Bryant, What I Saw in California‎

Look at those leggins!

1856, John Esten Cooke, The Last of the Foresters‎

Between the two of us we choked her hold loose, but she brought Jones' leather leggin in her teeth.

1922, Zane Grey, Tales of lonely trails‎