Fits better than expected, Lights are an issue. I ordered the 3-4/3T size for my 4yr old who usually wears a 5T (she's 4.5in tall and 41lbs). I was nervous about the fit but it actually stretched out and fit decent. We're going ahead and ordering one size bigger to see if it's slightly better for her. But it's super cute and exactly what she wanted!I do take issue with the skirt lights because they flash and don't cover as much of the skirt as the picture shows. I really wish the skirt lights didn't flash. Her brother has seizures and plenty of other kids do, too, so this design is a problem and we won't be able to use that feature.*Second picture shows where the shirt lights are. Ours we're centered.