Let me first tell you there are alot of free modeling applications out there in the artist world.
Try all of them out. I can't tell you which one works best because it is one of those, how well do you work with the application. Some programs are easier to grasp then others. Once you find one that you can adapt to and have good results then contact some of the modelers within the community
some tutorials might be out there. Phil C. Is a good point of contact when trying to develope the nack for making clothes. Remeber it's important to not lose hope, building clothes or buildings from scratch takes experiance and patients. Lots of patients :) But with the right tutorials and help from fellow modelers you will be on your way to success and develope your own clothing line.

Just some helpful ideas from the sgt.

sgtprotex1@netscape.net

University of Pheonix Alumni 2008
AA Criminal Justice Degree
BA Criminal Justice Degree

Currently study in Parapsychology