"My daughter is 5 1/2 and is skinny. Usually wears a 5slim or 5. This 4/6 size costume was good length but the top was kind of loose so I just used a simple safety pin in the back and it pulled it all together perfectly. She has already worn it once and wore shorts and white T underneath. We will do the fishnet tights and white turtleneck on Halloween when it is cooler. We bought a pink curly wig to go with-supercute! Hat has loops for pins or barretts to attach."