My son wears size 9-10 pants from almost every brand. I bought 10 of these even though I'm "thin". Too small. I liked the quality and style so I returned them for 12. My son could barely close them and they were way too long. I'm sure a 14 would fit but would be too long so we went with a different brand instead.
Classic Levi's Boys' 505 👖 Regular Fit Jeans for Everyday Wear
38 Review
Spotted Zebra Boys' Stretch Denim Jeans by Amazon Brand
64 Review
Boys' Basic Skinny Jeans from The Children's Place
41 Review
👖 Essential Straight Fit Jeans for Boys: Top Choice in Amazon's Boys' Clothing Collection
47 Review
🍉 Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
🔥 Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
👖 Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review