What to wear?!

My sisters wedding is within two weeks and I still haven't made up my mind. Next to the brides made dresses we have, I also have to wear a regular dress during City Hall. I found these 3 dresses, didn't kno which one to pick so I ordered all of them. Which one do u like? The Mink colour dress was neccesary incase I have to cover up my INK. I know it looks kinda plain, but proper for a wedding? I don't want no oldies get a heart attack when they see that ink on me for the very first. Than again, most of my fam bam already kno, so I probably end up wearing the other two. Decisions..decisions *sigh*