I would start talking to dress shops and looking if I were you. There are certain designers that can get dresses in sooner than 6 months. I heard that Mori Lee has some dresses that they have in stock that may only take 2 months. Also, you could buy a dress off the rack but that could be risky. Explain your situation and don't let them talk you into anything that you are not comfortable with. Good Luck!!
And I agree with Christy about the lace up dresses. I've tried several on and it's amazing how you can be a complete size or two different and it's still flattering!