I bought a size 7 for my 5 year old grandson and it fits perfectly! I thought he might be too big because he wears a 5/6 but a size 7 fits really well.
Comfortable & Practical City Threads Underwear: Sensitive-Friendly Boys' Clothing
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π¦ ViCherub Boys' Black Large Underwear - Pack of 3 | Boys' Clothing Collection
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Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
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