My 6 year old is tall and skinny and would probably fit a 4T waist if they were long enough. I looked everywhere for jeans. Didn't have to FULLY pull the elastic sides and forget about the elastic waist, they were too big (I tried Levis, Gap, Target brands). These are the ONLY jeans that fit perfectly and are this cheap! Lightweight jeans but they seem sturdy enough to last the season. The only other slim fit pants I've found are Lands End, but they're under $$ so I recommend slim fit pants.
Classic Levi's Boys' 505 👖 Regular Fit Jeans for Everyday Wear
38 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
👕 Thermal Blue Thicken Boys' Clothing by FREDD MARSHALL
36 Review
🔥 Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Waterproof Cozy-Dry Rain/Snow Pants for 💧 Kids by JAN & JUL, with Fleece Lining
64 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review