What's more glamorous than a pair of square sunglasses? On your face, they give you a mysterious, movie-star look. On top of the head, they serve as a chic headband. Look for sunglasses with frame shapes to flatter your face. In general, choose the opposite of your face shape: rectangle for a round face and round shades for an angular face. However, large oval frames look good on most face shapes. Black or tortoise frames are classics and look good on almost everyone.