So, I'm not sure how or where I found this, but it looks pretty easy, cheap, and very...damn it, I forgot the word. But anyways, it's a way to make a manikin to your exact measurements and pretty much all you need is a t-shirt and duct tape...yeah you need other stuff but...it's not like you don't already have the stuff lying around...
here's the link
http://www.taunton.com/threads/pages/t00002_p2.asp