A dress that moves in the ocean breeze is always becoming, but you don't want something SO loose that you have to hold it down during the whole affair just to avoid embarrassing over exposure. Chic sandals , low heels or wedges will allow you to move gracefully through the sand.
Cocktail attire allows for so much creativity. Dresses, of course, but also long, silk robes, jumpsuits , and separates are all chic possibilities. Contrasting pieces, such as leather with silk or a tailored suit with a lingerie underpinning, always make for interesting combinations.