These are the actual measurements -at gauge,
at the underarm immediately after holding the sleeve,
for each size:
XS 28.5 plus 6 inch band overlap at front
S 31.75 plus 6 inch band overlap at front
M 35.25 plus 6.5 inch band overlap at front
L 39 plus 7.25 inch band overlap at front
XL 42.5 plus 8 inch band overlap at front
2X45.5 plus 8.5 inch band overlap at front
3X 48.5 plus 9.25 inch band overlap at front