I bought my son a size up but he fits perfectly (I bought a size 8; he is a size 7). I bought size 14 for my nephew and he was too small. This is good quality but you need a few sizes up (I say this when my son is slim).
π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review