Tex, FWIW
A long long time ago, in a far away land, I made a pair of leather leggings.
I went to Goodwill and bought a large size pair of trousers.
Brought them home and cut off the legs, leaving the front pockets intact, while cutting out the hip pockets.
Cut out the seams, opened them up, and that was my pattern.
The leather was from Juarez Mexico, thick, hard to cut, hard to sew and, I was told later, cured using the urine from Cattle and would stink once wet.
Well, it didn't stink when wet but it became practically "bullet proof" with stiffness and hardness.
To overcome that I removed the sinew opened them up and rubbed them down real good with Anhydrous Lanolin, which was very cheap back in those days in the Southwest.
I wore them for several years back in the 1980s.