1 t-shirt, one size too big
1 skirt, two sizes too big (or waist size matching shirt girth)
First, I cut off the elastic from the perfectly good skirt...
Then I took the shirt and folded it inside out.
Leaving the skirt right-side out, place it inside the (inside out) shirt and align the ends. Pin in place.
Here's an inside look of what's going on. My husband says I confuse people by waving my hands around... hopefully that doesn't translate to blog.
Sew a zig zag along the seam. I went back and sewed straight down one side of the zig zag, but that's not absolutely necessary.
Trim the excess, turn the dress right-side out and sew some coordinating ribbon on. Mine only coordinates a little... but I'm okay with that. I also made a fabric flower out of some scrap fabric but a bow made out of the ribbon would have looked good too.
Put it on your daughter and it will look even cuter. : )