My oldest is tall (10-12) on most brands.
I took XL as these sizes are good and not what I'm used to. They are comfortable and the material is of good thickness.
Top-Quality Amazon Essentials Boys' Uniform Big Woven Flat-Front Khaki Shorts for Style and Comfort
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π Disney Jersey Shorts for Boys - Spotted Zebra Clothing
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Grafton Cargo Shorts for Lee Boys: Optimized Dungarees
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π©³ Boys' Clothing: Khaki French Toast Pull-On Shorts
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π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
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π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
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Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
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