Here is the tutorial from the dress I posted earlier that I made for my daughter. This dress is a little different because it is not a halter, and actually fits! She had a little girl cousin that is only 3 months older than her, so I made the girls matching dresses! Here is the tutorial.
First I just roughly measured my daughter, then I cut out a shape kind of like a trapeze dress would look like. I made it about four inches longer than I wanted to account for the top and bottom hems.
Then I hemmed up the sides about 2/3 of the way, leaving room for the arms and the top seam.
FIRST hem the arms, then fold under twice for the hem of the top. Make sure it is open on both ends so there is room to put the ribbon through.
Then, using something to push the ribbon through, push it through the front, then continue the ribbon to the back of the dress. You should end up with both ends of the ribbon on one side of the dress.
I taped my ribbon to a crochet hook and pushed it through.
FINISHED PRODUCT! It ties on one side, and looks like a cute little sleeveless dress. VERY EASY!