Here's a dress that I made a while back. A friend of mine asked me to make her a dress and I needed a prototype out of another - less expensive - fabric. It's quite an easy design, with some elastic around the waist and a low back.The edges take quite some time to seam, so consider this when choosing your fabric.
and here's the final version for my friend:
The left dress is also made by me, and you can view that here.