Sunglasses are the perfect accessory. They serve me well in the high desert with the vast and cloudless sky, and the blinding snow. They are also essential for striking a fierce pose at the pesky paparazzi - combined with a simple scarf and some red lipstick, it always looks mysterious and chic.
I always go for the oversized, retro look. It fits my face well and hides my betraying eyes ... so you never know what I am really thinking.