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!

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