Thanks for pointing this article out. Mahadevan (with colleagues) published some interesting research last year on the mathematics of drapes and folding in fabric. I collected the various links to abstracts and submitted papers here: http://www.christopherdgray.co.uk/archives/2004_02_01_archive.html#107618266046804466
I was more interested in how designers might harness such theories in the design of their own folding planes, whether architectural or landscape and wrote a little article as a result: http://www.christopherdgray.co.uk/2004/05/folding-land.html
Keep up the interesting posts!