After measuring my waste I cut the top part of the top piece so that it would fit my waste. I then cut a diagonal line from there to the bottom of the skirt on both sides, creating an A-Line shape.
Finally, I sewed each piece together and then sewed up the sides. I used the bottom of the brown shirt as the bottom of my skirt which meant that It was already finished on the bottom...score! Because the skirt is knit I didn't feel the need to finish the top. The project took me a total of 30 minutes and I think it turned out super cute!