This is a promo video for a firm that manufactures Corvette seats, but if you skip the first 30 seconds you'll get a look at what goes into one; they're essentially really complicated upholstery jobs combining CNC cutters and actual human beings with sewing machines. I found the bit about how they map out flaws in the hides, then cut around them, interesting (if wasteful-looking). And these guys even make their own foam.
Comments
Re: wasteful process - It's my recollection that unused leather trimmings and scrap from this type of production method is shredded and used in bonded or composite leather products. If memory serves, the parts that are trimmed off contain flaws which are marked ahead of time via an automated optical eye system or by an inspector, and the automated trimmer avoids these areas.