My son is 9 years old, about 54cm tall, 65lbs. I bought him a large one because they tend to shrink. It fits well without being too short or too high.
Boys 3D Graphic Hawaiian Aloha Short Sleeve Dress Shirt Tops with Button Down - Sizes 2-8 Years by Uideazone
47 Review
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
Boys' Long-Sleeve Disney Star Wars Marvel T-Shirts by Spotted Zebra
46 Review
๐ Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
๐ฅ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Waterproof Cozy-Dry Rain/Snow Pants for ๐ง Kids by JAN & JUL, with Fleece Lining
64 Review
๐ Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review