Apparel T-Shirt Adult Size Chart:
Size: Small - Width 17 Inches - Length 25 Inches.
Size: Medium - Width 20 Inches - Length 25 Inches.
Size: Large - Width 22 Inches - Length 25.75 Inches.
Size: X-Large - Width 22.50 Inches - Length 27 Inches.
Size: XX-Large - Width 25 Inches - Length 29 Inches.
Size: XXX-Large - Width 26.50 Inches - Length 30 Inches.
***Width is measured shoulder to shoulder***