Size 4-8! If I learn how to sew properly in the next year (one of my many plans), I can make all kinds of adorable dresses for Kavi out of those shirts. :-)
NOTE: On further poking around, this appears to be the original shirt dress pattern, sized for 2T-3T, with lots of pics of variations. Omigod, cute. And supposed to be beginner-level sewing, woohoo!