
Those are good basics. You seem to be missing something. Measured Horizontally: Large measures 10 inches from underarm seam to bottom of shirt. Sleeves are 15.5 inches long. and the width at the center is 17 inches.

Star Wars, Marvel, and Disney Short-Sleeve T-Shirts for Boys from Amazon Essentials
50 Review

The Good Day Lab Clean Shield: Ultimate Comfort and Breathability in Tagless 4-Way Stretch Polo
43 Review

Soft Brushed Fleece Crewneck Sweatshirt for π Boys and Girls 4-12 Years - Kid Nation Kids
42 Review

Van Heusen Sleeve Dress Poplin
42 Review

Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review

Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review

π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review

π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review