This look is so perfect for summer. It looks casual even though I am wearing heels and the braid is easy to do. The original dress was from Rue 21, the vest is by Self Esteem, and you can buy the exact necklace here and the exact heels here.
For my hair, I just did a simple fishtail braid leaving out a few of the shorter layers of the front and curling them. I took a piece of fabric I had and wrapped it around the end, forming a bow.