I bought a size 18 ie 29 x 29 for my 14 year old son and they fit us now. He is tall and thin. The length is perfect but there is some room around the waist. Not that they fell off, but with a strap for comfort. Also, they look more like a fitted one than a skinny one, but that doesn't bother him.
Ultimate Comfort for Boys: Lee Performance Series Extreme Comfort Slim Fit Jean
41 Review
👖 Top-notch Style and Comfort: Amazon Essentials Boys Slim Fit Jeans for Boys' Clothing
43 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
👕 Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
👖 Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review