M-1
L-4
X-3
XX-1
3X-1
4x-1

Printed on front of shirt

Small thru 2x are on BELLA BRAND FITTED SHIRTS
3X THRU 5X ARE ON GUILDAN BRAND TSHIRTS

SM MD LG X 2X 3X 4X
LENGTH 28 29 30 31 32 33 34
BODY WIDTH 18 20 22 24 26 28 30
NECK 6 1/2 6 3/4 7 7 1/2 7 3/4 7 3/4 8