What to wear?

So I've never been to a wedding where I knew I would be in the photos and I wasn't assigned something to wear. Worse yet, my whole family will be in the photos. Yes, my little brother is finally getting married. Now I have to dress my family. So I thought I'd start with an easy one, Adaya. She just needs to look super, fabulously cute. So the question is...

This

or that

or something else. What do you think?