Does two-costume rule use only to the bride?

Dear Miss MANNERS: At the time the bride improvements out of her wedding ceremony gown into a little something else, is it Okay for the bridesmaids to also change out of their dresses into something extra comfy? Really don’t wanna breach wedding day protocol.

Light READER: What bewilders Overlook Manners about this new practice of altering mid-celebration is why a bride would invest in an not comfortable wedding ceremony gown.