sitting down in dress

I had a similar issue once as a bridesmaid. I had a "hoop" underskirt thing, and when I got into the car to go to the church everything went oopsy and the hoop was round my knees! (attractive look!) - It was only for a short while though and we managed to sort it out for the sit down meal (I think I actually removed the underskirt lol

My advice is don't worry. Wedding dress designers and alterers are magic and you will be fine. Are you having a corseted top. Nothing will re distribute anywhere once you are in one of those beauties and it's properly fitted!

I sat down at one of my fittings as well as jumped about (as I am wearing with no bra) just to make sure - if you have not had your final fitting then you could try this to alleviate your worries ?