It seemed best to start from the innards, and work outwards. I've been piecing together two layers of sweaters (acrylic mostly) and one layer of blanket into a thick vest. Sleeves, collar, outer shell, lining, and zipper to follow.
The coat shape is a simpler, larger version of a shirt.
When re-using sweaters, it is best to stitch along the edges before actually cutting them, so that the knitting doesn't unravel.
The machine sewing is going about as well as usual. I decided it was time to take a break when the needle fell way down into the machine when I was cleaning lint out of it. I'm going to have to turn the machine upside down and shake it to get it out.