I have the Lutterloh System. If you intend on making your own patterns, or wish to alter store bought patterns even, and if you sew you're own clothes it is well worth the expense.
You will learn how to take the basic pattern and have something that totally fits YOU. From the basic pattern you then can alter any other pattern.
Once you see how the pattern works, you can then measure on yourself to determine how a pattern should be so that anything you make will fit your body. Did you know that your right side can be different from your left? Knowing your own personal measurements will help this.
With this system you can also then make clothes for others that will fit them.
Pam M