My daughter just outgrew 4t and switched to 5t. The 5t I bought is a bit small, but I only need it in the spring here in Minnesota so it will do. My son just moved to a 3t and I bought him a 3t and had to return it for a 4t which fits him very well. I would say buy 1 size larger than necessary. They're cute and warm and have a decent hood to protect their head from the weather.
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