Grab an old summer dress, preferably one with ruffles on the bottom- makes for a way cuter skirt in my opinion- in our case the dress had a few stains on it so it was easier to cut up. Depending on how short you want your skirt, start cutting off the bottom of it.
Next dig out an old pair of jeans, we put these away about 5 months ago. They fit her around the waist, but were too short. Girl's got the case of the long legs. I thought these were perfect because they already had a cute butterfly on them!
I didn't take a picture of this step, but cut off the legs right above the crotch seam. Try to cut as straight as possible if you can. Then take your piece of cut off dress and pin (you will need a good amount of pins for this) all the way around to the jeans, right sides together, with the seams matching on the sides if you can. Then carefully stitch around at about a 1/2 inch seam.
Finally, grab your cute girl (one that wears socks with her flip flops) and have her model her new skirt. :)
See how fun, cute, easy and cheap is that!