The fabric is a charmeuse satin I got from fabric.com to go with the crepe robe fabric I've had for years. I thought it was a pretty good match.
I made the pattern by tracing off a gown I already had. The gown and straps are all cut on the bias, so fitting is a not really an issue. The front and back are the same.
I attached the straps with these small bone rings I got from a free table at one of my sewing meetings.