My daughter is 3 now and will be 4 in June, a month before the event. So I ordered a size T but it's short, I hope it will be a bit bigger this time, but if you want a dress above the knee then yes, order that size, if not you can reduce the size, because it is a bit long, hopefully by then it will fit her perfectly, but I would say it is longer than the girl in the 1st picture with boots and above the knee.
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