On Sun, 23 Jan 2005 18:09:35 +0000, Peter J Hemmings
wrote:

These seem to be made by pressing or (glueing) the 8mm foam cover to
the fabric and pressing the foam flat.

Hot iron usually.

Easiest way to simulate this is by stitching through.

www.jamilton.co.uk have an ugly web site, and their foam ordering
system is broken (it over-charges massively), but they're handy for
sundries like big upholstery needles.