Well the great news is that yesterday I was invited to a black tie ball which is a good excuse to make a new fancy dress. The less great news is that it is in 2 weeks time which does not give me a lot of time, but is doable in theory.
I had a rummage through my ever growing pile of Vogue-patterns-in-waiting and found this one - V1108 by Bellville Sassoon that I planned to make last year. I'm thinking about making it full length, though that is a decision I can make down the road and I will buy enough fabric so that I can. I may cut it down later to make it more practical for future occasions.
I know the bow is not to everyone's taste but I think I'm going to go with it!
I made a muslin of the main dress pieces (this pattern has a separate foundation and lining too), a 12 at the neck and a 14 everywhere else, and apart from a bit of gaping at the back neck it's a good enough fit for me to dive into the real fabric. That I still need to buy. I hope I can find something tomorrow, I really want a heavy crepe back satin, but beggars can't be choosers so I will report back soon!