Guide to Land's End Sweater Sizes

Men's

M - 38-40
L - 42-44
XL - 46-48
2XL - 50-52
3XL - 54-56

Men's Tall (same as above, but a longer torso)

L
XL
XXL

Women's

S - 6-8
M - 10-12
L - 14-16
XL - 18-20
1X - 16W-18W
2X - 20W-22W
3X - 24W-26W
 
These sweaters are 100% cotton and machine washable. Someone with
more experience than I can speak to the possible shrinkage issue.