MEN'S TOPS
see below for more info
Size  Chest Width
X-Small 20.5"
Small 21.5"
Medium 22.5"
Large 23.5"
X-Large 24.5"
XX-Large 25.5"
XXX-Large 26.5"

 

WOMEN'S TOPS
see below for more info
Size  Numerical Sizing
X-Small Size 0-2
Small Size 2-4
Medium Size 4-6
Large Size 6-8
X-Large Size 8-10
XX-Large Size 10-12

 

YOUTH TOPS
Size  Numerical Sizing
X-Small Size 2-3
Small Size 4-5
Medium Size 6-7
Large Size 8-9
X-Large

Size 10-12

XX-Large Size 13-14