You might want to go up a size as these shirts run small. The plus size is perfect for my very young son but he usually wears size 8-10 pants and size 10/12 shirts.
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
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review