Please use the size table below as guide:(CHEST CIRCUMFERENCE)

Teens:
Boys - regular fit
6 -- 24 -25
8 -- 26 - 27
10 -- 28 -29
12 -- 30 - 31
S - 34 - 35
M - 36 - 37
L - 38 - 39
XL - 40 - 41
XXL - 42 - 43

BOYS - SLIM FIT

S - 34 - 35
M - 36 - 37
L - 38 - 39
XL - 40 - 41
XXL - 42 - 43

GIRLS
2 -- 18 -19
4 -- 20-23
6 -- 24 -25
8 -- 26 - 27
10 -- 28 -29
12 -- 30 - 31
S - 30 - 31
M - 32 - 33
L - 34 - 35
XL - 36 - 37
XXL - 38 - 39

MEN (REGULAR FIT)
S - 33 - 34
M - 35 - 36
L - 37 - 38
XL - 39 - 40
XXL - 41 - 42
XXXL - 43 -44

MEN (SLIM FIT)
S - 31 -32
M - 33 - 34
L - 35 - 36
XL - 37 - 38
XXL - 39 - 40

LADIES
S - 28 -29
M - 30 - 31
L - 32 - 33
XL - 34 - 35
XXL - 36 - 37
XXXL - 38 - 39

measurements are in inches

HOW TO MEASURE: measure under your arm around the fullest part of your chest or bust.