Sizes fail! I bought size 5T and got 4-5T and it's small. My recommendation for you is to order one size up. Beautiful dress, well made but the size did not fit. I suggested 5T and 6T, got 4T/5T and 5T/6T and then the regular 6T. So it's confusing, not sure if it's between sizes or not, but definitely the 4T/5T dresses I bought were small for my daughter.
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