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I think at 7 months pregnant you get a lot of leeway. Plus, in my experience "black tie" is often somewhat flexible for ladies- like a fancy cocktail dress with the right jewelry and shoes is fine for any lady there, so especially so for a pregnant one.

I don't think you ever NEED a floor length dress for black tie. COcktail length is totally appropriate. I"ve been to three black tie weddings while pregnant and wore knee length dresses to all!

You don't need floor length for black tie, as long as it's a fancy cocktail dress.

I'm sure a cocktail dress will be fine, but I personally think a baby bump in a floor length dress looks super glamorous!

I have seen quite a few pregnant women in this particular floor length sequin dress by Badgley Mischka and they have all looked amazing.

https://www.renttherunway.com/shop/designers/badgley_mischka/glitz_gown

I just went to a wedding and went through this same question. I looked at mine for nine and they had some good options, but once I added in shipping, it was only an extra $20 to buy the dress I wanted outright, so I did that. And then I ended up spending another $20 to get it in the floor length version, because I do think it's more appropriate for black-tie. I ended up in http://www.seraphine.com/us/emerald-sleeveless-maxi-knot-dress.html but this company has a lot of nice, formal maternity wear that would also work. My good friend was also pregnant at this wedding (her due date was literally 3 days away) and she wore a strapless bridesmaid dress from Target dress that isn't maternity, but totally worked and she said it was only $50!