Yes, you can draw any pattern you like. The macro patterns will not work for doll clothes, though, so you'll have to draft them yourself. They've been tested with hundreds of subjects. The fitting method is based on a system that has been in use in Scandinavia for decades. Our designer also teaches sewing, and she has also tested the measuring instructions for ease of use.
Most people get a good fit on the first try.
Everybody should make a fitting muslin first, to check your measurements. For the few people who can't get a good result, or if you have a special fitting problem such as uneven shoulders, our CAD features give you the tools to alter the pattern as necessary. Try entering your own measurements and sew up a muslin for yourself. Fitting ladies' pants is a fairly rigorous test for a computer program, and we think you'll like the results. I'm a professional pattern maker.