Yes! That would be great. I also recommend choosing a favorite and a back-up just in case you don't love how it looks on you! I'll be sure to have them ready to go for you.
This will depend on what you choose. I always recommend coordinating not entirely matching to make the photos look harmonious and cohesive. I also recommend considering your location and time of year to make sure everyone is comfortable!
Most of the dresses in the client closet are size flexible! I'll bring clips that we can use to tighten the dress to fit you in a flattering way (don't worry, I'll photoshop those out of your final images!). I also include sizing on the dress details to give you an idea!