1. Decide how much to cut off of each side, depending on the width of the child. Leave the top alone. Decide what length you want the dress to be, depending on the height of the child.
2. Use the side pieces that you cut off for straps. Decide how many inches the straps need to be, again, depending on the width and height of the child.
3. Finish the straps and sew them to the front and back of the garment. Here's the dress! It's that simple.