Not European but my son would get a terrible rash from swimming trunks. After wearing such swimming trunks, the problem is solved! He is 12 years old and has a 241/2" waist. Ordered on 10/12 had to send back and got a 7/8 which fit perfectly! He is small for his age.
Platinum Rashguard for Boys by Kanu Surf
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Pineapple Print Medium Boys' Spotted π Zebra Shorts - Trendy Clothing for Kids
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LUCOWEE Anti Chafe Boys Swim Trunks: Boxer Brief Liner & UPF Quick Dry Technology
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π Stay Safe in Style: Kanu Surf Boys' Protective Rashguard in Charcoal
44 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
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π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
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Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review