100% First Quality Cotton Denim Long Sleeve

The sizing runs BIG
(For example, a man 6'2", 185 lbs. would take a
LARGE size comfortably with a little room to spare.)

SMALL - 43" AROUND CHEST (woman's size 12)
MEDIUM - 46" AROUND CHEST (woman's size 14-16)
LARGE - 50" AROUND CHEST (woman's size 18)
EXTRA-LARGE - 54-55" AROUND CHEST (size 20-22)

A woman's body measurements who takes an XL (size 18
according to charts) is listed as having a 42 1/2" chest.  In
order to allow enough room to move freely, my opinion is
that she would then need a large that measures 50".