This is the cutest thing I've ever made for Rachel. Not that I've made her that many things yet, mostly because she's been so tiny and I've not wanted the headache of redrafting patterns. You can see the first dress made from this pattern here. It was pretty wide on her and didn't get worn much. The good thing about being so slim is that most of her dresses can be worn again the following year as tunics with stretch pants underneath. I made this dress in the same x-small size, but added 4" for length, and you can see it hits right below the knee. I also carved out 1/2" from the underarm to make it wearable as a jumper over other shirts.
Now that she's finally fitting into patterns, expect to see a bunch more sewing for her. (Especially pants and overalls this fall/winter as they are impossible to find for such a skinny-minnie.)