I wasn't sure what size to buy for my son who wears a size 14. They fit but run a bit big. So I'd say XL is probably a 16, maybe 18. It's hard to tell what you're getting by size with Revain clothing, so I decided to just look at the size. The material is fine and they have withstood several washes so far. I would buy again.
Pack of 6 Baby Soft Cotton Underwear for Little Boys - Dinosaur Briefs, Toddler Shark Undies, Children Truck Panties
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64 Review