Added Jul 15, 2012
I used Simplicity 2580 but cut the skirt shorter in order to make a top instead of a dress. I also took the skirt in by 1/2" (bottom) to 1/4" (top) in order to get a more fitted look. I used 1-inch black fold-over elastic to bind the hem and arms, but did not stretch the elastic as I sewed because I wanted the binding to lie flat. I love this top and the dress pattern and I plan to make more variations, including a long-sleeve version for the fall.
The fabric is a polyester or ITY jersey that I found on clearance at fabric.com ($2.39/yard!) about 1.5 years ago. I bought the fold-over elastic from an etsy seller (http://www.etsy.com/shop/paviapavia).