Can the Lutterloh system be used with patterns I already have, ie; Simplicity, McCalls, etc.?

I recently looked up the info on the Lutterloh Pattern fitting system and found it quite interesting. I have always had trouble getting my garments to fit correctly and am considering buying this system. But before I do, I'd like to hear more about it from past and/or present users. I'm a bit pear shaped and have sloped shoulders. Since I live in Florida, my wardrobe consists mostly of tank tops and shorts or capris. Does this system work for making skirts, shorts and slacks? Are the patterns up-to-date styles? All of your input will be greatly appreciated. Thanks much.
Artze

Fabulous!!!! I think your design is timeless. Keep up theexcellant work.