Unfortunately, developing a system like the one your talking about would be insanely difficult. On the plus side, there are alot of easy to use technologies that will help you attain your goal hopefully.
Generally, the way that this type of thing works is as follows: You make some 3d asset in a modeling program such as Blender, 3ds max, Maya, Softimage, etc, and then use this in your program/game. You can think of these programs as just spitting out a bunch of 3d coordinates, which your program, with the help of OpenGL or DirectX can load into memory and render.
Modeling and loading assets is of course the alternative to developing algorithms to generate points. This is what it seems like your trying to accomplish.
The bad news is that clothing is really really complicated. A big part of this is due to the fact that most of it requires simulating cloth dynamics. Another part of the problem is that even if you had a 2d pattern, how would you the manner in which the clothing would adhere to your human model? Is it skin tight? Loose? How will you parameterize that? The placement of the actual clothing on the body is a chore in and of itself as anyone with experience in 3d modeling might tell you.
Nevertheless, some of the industry's brightest professionals are looking for both better ways to simulate cloth, and better ways to automate asset creation.
In summation, the easy answer is that what your trying to do, as interesting and noble as it may be, is going to be extremely difficult and may not have the result your looking for.
As for where you can go for more answers:
If your still intersted in finding a way to automate clothing attatchment to models, I would start by looking around academic websites. Look for any computer science departments which have computer graphics research programs. You will find alot of interesting things there.
For more academic type resources look at Game Programming Gems, GPU Programming Gems, and Graphics Programming Gems book series. They feature many good articles that tackle difficult graphics problems such as these.
Another thing you might do is check out blender a little more. There is an interesting project called MakeHuman
http://makehuman.blogspot.com/
That automates the process of developing human models in blender.
There are a couple of tutorials for putting clothing on the models, take a look at this one:
http://www.davidjarvis.ca/blender/tutorial-05.shtml
For more tutorials on clothing and cloth simulation in blender, you can always check out
www.blendercookie.com
cg.tutsplus.com
I hope some of this has been useful.
