Big Photo Cookie Monster Show Sesame Street Licensed T-Shirt T0023MS Big Photo Cookie Monster Show Black Short Sleeve Licensed- Authentic T-Shirt - Men's T-Shirt Color: Black - BRAND NEW Shirt Specific Dimensions (inches) Size Width Length 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.