Measuring your Chest:

Measure under arms around the fullest part of the chest.
Be sure to keep tape level across back and comfortably loose.

Measuring your Waist:

Measure around natural waist with a loose tape.

MENS
AAA Style T-Shirts
Size	S	M	L	XL	XXL
Garment Width (inches)	18	20	22	24	26
Chest (inches)	34-36	38-40	42-44	46-48
Waist (inches)	30-32	34-36	38-40	42-44

American Apparel T-Shirts
Size	S	M	L	XL	XXL
Garment Width (inches)	18	20	22	24	26
Chest (inches)	34-36	38-40	42-44	46-48
Waist (inches)	30-32	32-33	33-34	36-38