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There is more to sizing than just the chest circumference. I would recommend printing the default patter and doing a test fit. Then do some math to figure out the scaling for an approximate size for you, then print a second test fit. Adjust from there.
There is no, “you wear a medium size shirt so print at this scaling”. Everyone has a different size so you’re going to have to put in the time and resources to figure out what is going to work and fit for you.
Be sure to account for the thickness of the leather once you settle on a scaling.
