Also, I found some info on resizing vintage patternsI checked out the link and I do like the website. However, Jenny's pattern resizing tutorial is mis-named. She actually is describing a grading process. It is not a very precise method, but perhaps it would work for a custom or one-time project. I would still encourage my readers to learn a better method, especially for preparing patterns for production.
thought it might be of interest.
The idea of re-sizing patterns implies there is an inherent sizing problem which should be solved. If you buy a commercial pattern and you need a longer waist, then you would resize the pattern by slashing and spreading it longer to the required measurement. Jenny does describe such a process at the end of her tutorial.
Jenny goes one step further and shows how to alter an adult pattern into a children's pattern. The method probably will work, but it will require to much fiddling. Why not take a basic block the size you need and draft the same style?
I don't think I am being too hard on Jenny. She does have a nice website. Just realize her perspective is geared more to costumers and others who don't want to be bothered with details.