Men's shirts are plentiful in thrift stores, and often they are in great condition! I picked one up at our local Salvation Army Thrift Store for $2.99. It was even a fairly high quality "designer" brand! I put it on my dress dummy, Betsy, backwards, and proceeded to cut off the collar and cuffs.
With some quilting cotton I had on hand in my stash, I made bias binding and a sash for more feminine shaping.
And here's the final result:
For more details on this project, and more like it, please visit me at Seams Sustainable!