For our t-shirts, we use BELLA+CANVAS, style 3001C with the following features:
4.2 oz., 100% airlume combed and ringspun cotton, 32 singles
Shoulder taping
Side-seamed
Unisex sizing
Retail fit
Pre-shrunk
Tear away label
 
Measurements
 
in inches
XS
S
M
L
XL
2XL
Full Body Length
27
28
29
30
31
32
Body Width
16 ½
18
20
22
24
26
Sleeve Length
8
8 ¼
8 ⅝
9 ⅛
9 ⅝
10 ¼