The following are the brands and dimensions for the shirts that are typically found in MooseShirts.com:
HANES T-SHIRTS
S
M
L
XL
XXL
CHEST
--
18
22
24
26
LENGTH
--
27
29
31
32

GILDAN T-SHIRTS
S
M
L
XL
XXL
CHEST
18
21
23
24
27
LENGTH
29
30
31
31
31

FRUIT OF THE LOOM T-SHIRTS
S
M
L
XL
XXL
CHEST
--
20
22
24
26
LENGTH
--
29
30
30
33

JERZEES T-SHIRTS
S
M
L
XL
XXL
CHEST
--
22
23
24
27
LENGTH
--
28
30
31
32

ALSTYLE APPAREL (AAA) T-SHIRTS
S
M
L
XL
XXL
CHEST
--
19.5
21.5
22.5
26.5
LENGTH
--
29
29.5
31
33

* Note that these clothing measurements are approximate.