My bust is 56” and I’m knitting the 4x with a finished measurement of 52” for 4” of negative ease.

Modifications:
Knit the body to 16” before ribbing since the negative ease really ate up the length of the 9.75” body. Total body from underarm is 17.5”.
Did the hemline ribbing and bind off with main body needle. Did a stretchy bind off.

the 17.5” shrinks up to 10” once it is on my body! perfect cropped length for me, too!