My daughter absolutely loves this set, however, it does run just a bit small and I will be ordering it in an 8. I originally got her a 6/7 as all her size 7 FN clothes fit with room to grow. The tag on this one reads 6/6x which isn't exactly a 6/7 so although it fits, it is very fitted and a bit snug. She is 6yrs old, 37", and weighs about 55-60lbs with a solid build. If you're little one is between sizes I would definitely order up. We do love the set overall as it is very cute, decent quality, and looks exactly as pictured. I would recommend for sure!