Well, I put a lovely dress on dd today, that I just made this fall, and it already looks like it is shortening up too fast!  So, while at the store I bought a coupld of nice turtle necks that I'm planning to make into t-shirt dresses.  I've read about these on-line and found instructions here.  I'm planning to post pictures when my experiment is finished.  Momma doesn't have time to sew a few more play-dresses so this should be a quick and easy solution.