In one sentence, describe what the following article is about:

This dress combines a pillowcase and a tank top to make a cute, jumper-like dress. The key to making this dress fit properly is to use a tank top that is already somewhat loose on your child. If you use a tank top that must stretch a lot in order to fit your child, the dress may end up too tight; the skirt part won't stretch. Here is a list of what you will need:  Tanktop Pillowcase Sewing machine Thread Scissors Pins The tank top should fit your child well, but still be just a little on the loose side. Keep in mind that the skirt part of the dress will not stretch, so if the tank top is already tight on your child, the dress will end up too small.  Try using a solid-colored tank top and a pillowcase with a pattern on it. This will be the most pleasing to the eye. Patterns on both the tank top and the pillowcase may clash or make the dress appear too busy. You can also use a fitted t-shirt as well, just make sure that it is not too tight on your child. Do not turn the tanktop inside out. The right sides of both the pillowcase and the tank top should be touching. The cut edges of the tank top should be aligned with the cut edges of the pillowcase. The pillowcase will likely be much wider than the tank top. This is normal; you will be gathering the pillowcase later. Just make sure that the side seam of the pillowcase is touching the back of the tank top. This will help keep everything in place when you go to sew. Keep the pins a few inches apart, and pin all the way around the waistline of the dress. Be sure that the cut edge of the tank top and the pillowcase are matching up, or the skirt will be uneven.

Summary:
Gather your supplies. Find a suitable tank top and pillowcase. Turn the pillowcase inside out and tuck the tank top inside. Align the tank top with the pillowcase. Pin the pillowcase to the tank top.