So I made one for myself. It was quick and easy, about 25 minutes. I used a $5 white shirt from walmart. (it's actually a really nice t-shirt. soft and thick, but not too thick) I cut up an old shirt for the pleats and the strips on the sleeves.
While Ashley's daughter is certainly much more adorable in her t-shirt than I am in mine, I am very happy with the result. I think I will be wearing it a lot this summer. I love white in the summer, somehow it makes me feel less hot.
p.s.- Those earrings are one of the many pairs Jamie sent me. I love 'em!