This is the same dress I've been sewing (Simplicity 4206) with the exception that I have lengthened it from a shirt to a dress. I used some blue vintage gingham for the body and red vintage gingham for the sleeves. I wanted to add a little more red bling towards the middle/bottom, so I added a gingham star to the front.
And the back is plain. She watched the parade and waved her flag like a good little all-American girl. (I wore my Memorial Day skirt from last year.)