This is a reversible sublimated uniform with pictures available in the description.  PLEASE USE THE SIZE CHART for your child.  The easiest way to measure is by using a current jersey or tshirt that they love and it fits like you would want a jersey to fit.  Lay the jersey/shirt flat and measure armpit to armpit and compare to the size chart 1/2 CHEST measurement.  Then measure the length of the shirt from the bottom of the collar to the bottom and choose your size from the chart.
 
ADULT UNISEX SIZING
2XS
XS
S
M
L
XL
2XL
3XL
4XL
5XL
1/2CHEST (in)
18
19.5
20.5
21.5
23
24
25
26.5
27.5
28.5
To Fit Chest (in)
31.5
34
36
38.5
41
43.5
45.5
48
50.5
52.5
LENGTH (in)
28
28.5
29.5
30.5
31
32
32.5
33.5
34
35
 
 
YOUTH TOP
4Y
6Y
8Y
10Y
12Y
14Y
US SIZE
5 - 6
7
YS
YM
YL
YXL
1/2CHEST (in)
15
15.5
16.5
17.5
18
19
To Fit Chest (in)
25.5
27.5
29.5
31
32.5
35
LENGTH (in)
21
22
23.5
24.5
25.5
26.5