My dress was zipper with fake buttons......as lace up wasnt suitable for the theme BUT....
this meant......
When I needed the loo....
My cbm and I went to our room where I had an ensuite. She unzipped me, I stepped out, had a pee and then stood back in to get zipped up again. Hassle free, embarrassment free. Dont need to share your toliet habits with anyone! funnily enough I went to the loo only ONCE the whole damn day.