Isom Schumm

I have a wedding to go to in October and I'm torn between these two dresses, so if anyone has a spare minute could they please help me choose?
The wedding is on Halloween, but there is no theme (and I know neither of these are particularly autumnal).
Before you choose: my hair is quite brassy right now, I'm hoping it will be more of a chocolate brown on the day. And I will be wearing very large underwear that will erase any signs of a belly.
Thank you all.

So I have a wedding to go to in October. I posted the blue dress on here recently along with a pink one, and blue was definitely the winner of the two. But because I'm apparently the most indecisive woman on the planet, I've now got a red dress that I like as well.
Some context: it's a Halloween wedding - it's not fancy dress/themed, and there is no dress code, but (and I mean this with all the love in the world) these are not my most normal friends. I wouldn't be surprised at all if the bride came out in a black dress.
Also, a disclaimer as with the last post, I will absolutely be wearing underwear that smooths everything out.
Thank you all so much!