Maternity formal dress shops!?

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So I have a wedding in Oct. And I'm on baby #3 so my bump is obvious and I'm bigger chested lol so I need a good place to look for a formal dress it's a little black dress cocktail dress kind of wedding which for me I would prefer so longer dress but I dont want to spend a fortune last baby and I dont plan on going to any other fancy things lol. Any help would be great.