I'll start by just LOVE this brand. The quality and durability of their clothes keeps me coming back, not to mention they are very stylish! I would say the pants fit like loose pants versus tight top and bottom straight pants (if that makes sense). The elastic at the waist helped a lot as my son has a small waist.
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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Boys' Adidas Active Sports Tricot Athletic Clothing
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Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review