I made my waist high enough to leave room for my expanding belly. I also left my dress long. A lot of the girls cut theirs to knee length, which looked really cute, too. I wish I had gotten a picture of some of the girls' dressed, because they all turned our really cute.
I also made a little flower to pin onto my shirt with leftover fabric from the skirt. I used this tutorial, although I just cut circles instead of flower shapes.