"my daughter is a very tall and skinny 6yo and I purchased the size 4-6 and it fit her very well... but could not have been ANY shorter. (It was the only size left and I took a chance.) she looked fabulous and she loved it!! very happy with product. FYI: it is definately as flimsy material as it looks but she made it through the night just fine! & I bet it will b used for dress up many times in the future!!"