My 4 year old daughter is "unicorn size" in the sense that she can typically wear clothes for 2-3 seasons/years before outgrowing them (she still wears many 18 month old shirts and dresses). I bought these super cute mermaid print 4/5 pants but they were VERY tight and uncomfortable so we're going back. They are more like a capri leggings, exposing the panty line.
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