I would think burlap, cotton stuffing, then blanket then vinyl. The stuffing sandwiched between the burlap and blanket would help keep it from shifting around or clumping.
As I recall, my seats had a layer of coarse woven material over the burlap and under the cotton stuffing. Here are a couple of pics showing what was on my seat when I pulled it apart. I reused that coarse material that was over the burlap. The kit I got from Jim Carter didn't have that coarse woven material, just some burlap, cotton stuffing and the blanket.

On second thought, if you don't have the coarse woven stuff I did, then the blanket should probably go over the burlap, then the cotton stuffing. That would help keep the cotton stuffing from squishing down among the springs.

Hope that helps.
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IMG_4473a.jpg (429.98 KB, 121 downloads)
IMG_4475.JPG (404.25 KB, 120 downloads)
Wire brushing the old cotton off the coarse "blanket"


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.