Do you know much about how leather is processed and used?
Leather is a highly useful, durable, and flexible material that is produced anywhere from a home tanning cottage industry to heavy industry. 
Is it produced in a lot of places?
People around the world use leather to create various useful goods such as hats, jackets, belts, gloves, even bookbinding and leather wallpaper! 
Leather wallpaper?  I did not know that was even a thing - can you tell me more?
It's sometimes called "wrought leather" and is usually gilded or painted. It was in use in around 1650-1750 to decorate the walls of of the wealthy.. 
Ah, so it's not in use anymore - or at least it's not widespread now.  That is interesting - what else about leather would be something unusual?
Sometimes people carve leather, but it must be vegetable tanned, full grain leather to work it this way. 
How do they tan leather with vegetables?
There's a chemical called tannin in the vegetable tanning process that strengthens the fibers. It's commonly found in many types of plants and bark, but perhaps vegetable is a misnomer.