This is not my best sewing job, but Gracie thinks it's amazing to have a superman maxi-dress. (I'm trying to convince her to wear as pajamas, not an actual dress around town.)
I used her brother's outgrown superman shirt and an old red shirt from my stash. I resized the superman shirt by an inch on each side, kept as much of the length from the red shirt (by request) and then sewed them together.
After I took this picture, I measured around her little waist and then added elastic at the waist seam, hoping it would give the dress a little more shape. It didn't work. The dress is still loose around her waist (should I have subtracted an inch or two from her waist measurement?) Also, the red skirt portion was almost the same width, so there wasn't much room gathering needed.
Any ideas to do a better job next time?