I would check with the dress maker and see what her requirements for adjustments are. Can you wait and see? The stress of the wedding might just cause a flare so you might just be back on pred and if all else fails you can tack or clip the dress.
We will find a way, or make one.-Hannibal (crossing the Alps in the 15th Century on war elephants)
Praise in public, chew in private.
Make sure your suffering has meaning....
All suggestions/options/opinions are caveated with please consult with your local health care provider...