Perfect fit for our 3.5 year old. She wears 4T on most brands. She is about 38 inches tall and weighs 35 pounds. She wore the pants under another pair of leggings several times as we walked through the national parks where the weather was 40-50. It seemed to keep her warm! looked like i want thermal underwear to be true to size. The trousers were very long. The crotch is very long, but the legs are a little long. to the middle of the rib. This isn't a problem for us, but if your child is petite you might want to try a different brand.
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