I am so glad I wrote on my wedding invitations "wear what the fuck you like". If the guests are so distracted by somebody's frock that they miss the vows, can't concentrate long enough to eat dinner etc, then they have all the attention span of a jeffing fish. And any guests assuming a mother is after an incestuous relationship with her son needs a bloody therapist.
OP, fuck it. Get a feather boa, sashay in during the vows to I Am What I Am.
You sound brill and I love love love the dress in floral. Can wait to see a photo.
I also can't wait for gay DD to marry one day. I'm going to wear awesome dungarees and a trilby. Or huge amounts of tulle and DMs. If you hang on op, I'll post about in due course (she's only 14 atm) and divert some of the frankly bonkers criticism away from you.