Men's Disney Kingdom Hearts Birth By Sleep Mayhem Black Tee T-Shirt Men's Disney Kingdom Hearts Birth by Sleep Mayhem Black Color Short Sleeve Licensed- Authentic - Men's T-Shirt - 100% Cotton Color: Black - BRAND NEW Shirt Specific Dimensions (inches) Size Width Length X-Small 18" 25" Small 18" 27" Medium 20" 29" Large 22" 31" X-Large 24" 32" 2X-Large 26" 33" 3X-Large 28" 34" Doubling the width measurement will give you the chest size.