Zimmermann Wishbone Sweater

Has anyone tested different sizes for this pattern (if you can call it a pattern- it reads like a meandering story) ? She gives stitch counts for a 42” sweater and provides mathematical equations for other sizes (that I can’t make divide into whole numbers to save my life!)
I love the sweater so I ordered her book to get it - I think I’ll stick to downloads from now on.
Help?!?

Welcome to KH!

Usually you can round the stitch number up or down as needed with EZ’s sweaters. Could you use a different weight yarn for the size you want?

It reminds me of a sweater that a friend is working on: