I ran across this video for making clothing patterns and was fascinated by the system. Interesting to watch especially for those of us who sew clothes. It's called the Lutterloh Pattern Making System. Oh, and BTW - I found it cheaper on the internet than on their site. Amazon lists it from private sellers and there are probably more, (eBay etc) but I didn't really search for more because I don't very often make clothes.
http://www.lutterlohpatterns.com/