I'm leaving for vacation on Sunday (Hello, beach! And a tip of the hat to you, pool-side cocktails!) and can't stop my mental turnstile from displaying swim-ready looks. So let's talk fashion math. A formula I always find super sexy is a strappy bikini coupled with delicate layered necklaces. An example: this sultry neoprene suit from Lisa Marie Fernandez with the above featured Jennie Kwon necklace and yet another simple but stunning Jennie Kwon creation. I'd do them both in yellow gold but get the diamond arc necklace in 16" and the knife edge cross necklace in 18" for perfect layering. Toss on this cover up and these darling Valentino sandals and head straight to Malibu.