Not off topic at all. If you don't have at least a layer of cotton in your seat, somebody took it out. I have a 53 Chevy in my shop right now, and the two original seat bottoms have burlap over the springs with a permalator embedded into the burlap. (A permalator is a fine wire grid that helps the burlap to keep the cotton from going through the springs.) Then there's a layer of cotton on top of that and then a layer of foam on top of the cotton next to the fabric cover. The foam is the latex type that gets hard and turns to powder with prolonged contact with the air. The seat backs only have cotton over the burlap. A deck pad will replace the burlap and do the same thing for the new foam.
The bad thing about cotton and burlap is that over time the burlap will disintegrate and the cotton will get musty. That's why I never use cotton or burlap in anything I re-do. There are synthetic substitutes for both products that will last a lifetime and won't absorb odors.
No one lives forever, the trick is creating something that will.