Upholstery is the weird, its all about adding the cushioning and covers to seats and things
Huh, that's is pretty weird. What else do you know about it?
A person who works with this stuff is an upholsterer
That makes sense haha. I really don't know much about upholstery to be honest.
You use things like springs, leather, animal hair, and other things
That's a pretty varied list of materials!
Yep, modern upholsterers use Dacron, vinyl and better springs
That isn't too surprising, as most things seem to evolve and improve over time.
Upholder was an archaic term for upholsterer 
Really? That seems pretty weird! You really know a lot about this!