I started with a tank top ($1.95 from H&M) and some matching fabric from my stash.
I had Hannah put the tank on and put a pin on her hip where I wanted the skirt to start.
Then I eyeballed the fabric to see how long the skirt should be.
I cut off the bottom two and a half inches of the tank with a rotary cutter.
The tank top was 12 inches wide at the bottom hem so I did some math and cut my skirt 9.5 inches long and 48 inches wide. I hemmed one edge and sewed the skirt together in a circle (and forgot to take a picture of that step).
After I had a large (48 inches around) hemmed loop/skirt I needed to make the gathers so the skirt would be the same size as the tank top (24 inches around). I adjusted my stitch length to the longest it would go and sewed all the way around the skirt at the raw edge leaving the threads long at the beginning and the end of the stitching. Then I pulled on the threads and fiddled with the fabric, sliding it along the thread, until I had gathered the skirt up to be 24 inches around. I actually didn't measure it with a ruler, just kept gathering it and laying it on top of the tank top until the skirt and tank were the same width. Then I tied off the threads.
Hannah LOVED it but I thought it was missing something so...
I used the bit of fabric that I cut off the tank for a headband.
This was a super easy project and definitely only took me about 20 minutes. I'm sure next time it will go faster because I'll have a little experience and I won't run out of bobbin thread halfway through. Next time I'll try to take a picture of every single little step but if parts of this are confusing the pictures on Ruffles and Stuff should help explain it!