My neighbor wanted to dress her little girl in some bandana dresses, so I got to sew some dresses for a change!
Let me tell you. Easy. As. Pie. (It's even waaaaaay easier than pie. Making a pie is pretty involved and time consuming actually).
Seriously. I'm talking, like, 10 minutes. Stitch up the sides, leaving about 6 inches for arm holes. Make a casing at the top, and then pull the ribbon through it. Done!