My daughter is turning 9 and I sewed her a size 8. It's a little big, but I didn't take all the seam allowance that I was supposed to, so that's probably part of the reason it's a little big.
The neckline looks great and detailed and yet it came together relatively easily. The whole dress was a pretty quick sew, which is the kind of sewing projects I love.
Check out Blank Slate Patterns - the Coastal Cargos are on my to-sew-really-soon list....
And totally unrelated, but how about PicMonkey and that whole turn-a-picture-into a vampire or zoombie thing - - crazy! (this is the "understated vampire" shot)