Simple Modern Sewing, help with sizing up patterns

I am looking for help in using a wonderful book of basic wardrobe pieces, that are printed on sheets of paper included in the book. The size range is Japanese, meaning their xl is about a US 12. I wondered if you would know of anyone who has altered these patterns upward, or has produced single size patterns out of the difficult tangle of pattern sizes printed by the publisher. Any leads as to wear else I might ask about this? I am from NE US.
Many thanks. Your site is lovely!

Hi there, I have not used the

Hi there,
I have not used the book (although it does sound like a good one!) but from what I can gather, you should be able to grade up the patterns like you would do with a conventional pattern. Just trace out (or cut out) the XL and then make the adjustments to fit your measurements. I recently tried grading for the first time and was surprised at how simple it was. I used the burda site to guide me:
On the site they have a tutorial for a bodice, a skirt and trousers, and although I am sure the patterns in your book are not the same as these patterns, you just need to copy the principle across. Draw the grading lines in the correct position and then distribute the allocated grade throughout the pattern piece. Good luck!

Thanks so much. I will use

Thanks so much. I will use that link. Somehow it just stumped me but this is good clear direction.

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