Schott leathers leather jacket hide aren’t that thick, actually. Many (if not all) of their leathers have felt material glued on the back (you can’t see unless you remove the liner), to make you believe their hide is thicker than they actually are.
I consider their leather jacket as “fashion jacket”, not as motorcycle garment.
Also, if the jacket fits you nicely, you won’t be able to wear armor underneath.
(That’s why companies like langlitz, Lost World don’t offer armor option. It is just impossible to put armor in their jacket without destroying the jacket’s silhouette.)
Langlitz
Lost World
If you want nice, clean look of the traditional leather jacket with PROPER protection, I would suggest to take a look at Vanson armored comet.
(And, read this article.
https://rideapart.com/articles/damn-i-look-good-in-this-jackethttps://rideapart.com/articles/crash-tested-vanson-ar2-jacket-and-alpinestars-bio-armor