A mantra: Choose sunglasses that complement the shape of your face. "Sunglasses should flatter your face. Pick frames that contrast your shape. As a rule of thumb, smaller faces should use smaller sunglasses, and larger faces can do well with larger glasses. Using a slightly larger frame can add that extra bit of glamour and mystery to your style," says fashion designer Garima Kapoor.

Oval face: "Almost any style can be used if you have an oval face," says Garima. You can experiment with wrap-arounds, shields and even square-shaped frames with slightly rounded edges.

Round: Choose frames equal to or a little wider than the broadest part of the face, with rectangular styles. The frames should make the face appear a bit longer and thinner. Sunglasses with higher temples or brow bars also appear to pull the eye upward, making the face appear longer.

Diamond: This face shape has wide or high cheekbones, along with a narrow forehead and chin. "Oval, square or rimless sunglasses can work, but make sure the frame is no wider than the top of the cheekbones," says Garima.

Square: This shape has a broad jaw, broad forehead and wide cheekbones. Oval, round and cat-eye frames can work well.

Oblong: Frames that widen and shorten this face shape are the ones that will work well, such as round or square shapes, or ones with decorative or contrasting temples that give the appearance of adding width.

Triangular: This shape comprises a wide forehead and narrow jaw. "Frames with a straight top line or cat-eye look will work well, but should be wide enough to balance the jaw. Metal frames with rimless bottoms will look good as well," says Garima.