Different necklaces flatter different people and different necklines. Take into account your entire body, the shape of your face and body type. For instance a choker suits those with a good jawline and a swan-like neck. Most people suit the Matinee length, 20 to 24 inches. It’s like wearing a v-necked top, it will elongate your neck and draw the eye down. Take into account your own personal style and wear what you feel makes you good. Accessories can make or break an outfit.