A Castilian Anniversary: A New Silhouette for the One I Love

We're celebrating it in a castle, and I wanted to surprise him by wearing a dress that leans on the more mature and sexy side of the spectrum, as he's rather used to seeing me wear more elegant or princess-y type of dresses.

I'm planning to wear fine, silvery jewels with black heels, maybe one of those black heeled sandals, perhaps with a string that warps around the leg, or around the ankle.