I found Lion Brand's Knit Sundress Pattern. I used this as the starting point of the dress and then modified it to make it into a Cars dress. I made the dress using Lion Brand Cotton-Ease in Stone and I used Lion Brand Cotton-Ease in Cherry for the trim.
I found this Lightning McQueen Chart and this Tow Mater Chart. I duplicate stitched the chart onto the pockets. I did have to increase the width of the pockets to fit the charts on the pockets, but I think it turned out really cute. She also informed me that the pockets are the perfect size for holding her cars and even some room to carry treats!
You can check out more details for this pattern and see some of my other knitting and crocheting projects on my Ravelry project page.