Sister In Law's Wedding, What should I wear?

These are my choices for a dress to wear to my Sister In Law's Wedding. I know this is silly but I have asked my sisters for their virtual opnion. It is so hard to shop alone for clothes or at least it is for me.

Dress 2 had 2 votes (by the way it is blue not black)

Dress 3 has one my husband.

Why do we as women obsess (maybe a strong word) worry over things like this? Really it is the brides day, no one will remember what I wore except in the family portrait.

Maybe I should go back to the drawing board.