I bought two pairs. One for my 4.5 year old and one for my 2 year old. I bought XXS for a 2 year old and S for my 4.5 year old who is tall for his age. He wears size 5-6. In both sets the shirt fit as expected, but in both sets the pants were two sizes too big. The XXS pants would fit my 4.5 year waist but are definitely too short. I managed to take the thread and tighten them enough to fit together when they grow in (hopefully next season) and I can cut the thread. For the price I expect the dimensions to be correct. They're warm and very soft, and I love that they have patterns that kids love, rather than a solid color like most thermal materials.
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