Simplicity 4206
http://www.simplicity.com/dv1_v4.cfm?design=4206
I used the skirt and the shorts out of this pattern envelope to make this skirt. I assembled the shorts and separately assembled the skirt, both all the way until they wanted you to create the waist elastic casing -- then sewed them together at the waist, created a casing and inserted the elastic, closed it up and viola, I have a true skirt with shorts on the inside.
I think this will not work for just any skirt/shorts pattern, they have to the exactly the same size around the waist to be able to sew them together (or you could use a knit and stretch it to make it work!).
This was a fun cheetah Girls fabric from my friend Tracy -- I have just enough fabric left to make the sleeves of the shirt in this same pattern envelope (view B) but I want to choose just the right fabric for the bodice -- something funky...It may take me a while to find just the right thing to make this shirt, but the skirt turned out awesome!