Ordered size 6-7 for my 7 year old granddaughter who is slim and average height. It fits perfectly. this dress is very beautiful. Whoever made it put a lot of work into it. Washed in the washing machine (cold water). I then used the sewing machine to fix any areas that were loose and/or poorly sewn. I didn't mind having the dress repaired because it's so pretty. My granddaughter will love it.