Black is a just color which you always see in some formal occasions. Once you are invited to attend a party or social events then a elegant and sexy black evening dress will be the best choice.
Then when you have chosen a right evening dress, the accessories are must fit. Here are some guides to match your evening dresses:

Lipstick and lip gloss
Red is considered an attractive color for lips, so it is always the best option for women to put bright red lipstick at parties at night.
Earrings
Wearing long earrings would be a great option. You can even use some items of jewelry, but other long earrings add a sexy look of your profile. It looks wonderful, especially with bare shoulders and halter dresses.
Fabric
Choose a dress that is made of a soft material such as cashmere, silk and leather. This aspect mild and temperate adds elegance and beauty to your style.
Design and style of your dress
If you have chosen to wear something that exposes your back, make sure your back is ready. It should be smooth and without blemishes. If you know that you are likely to have acne on the back, and then do not go by without support for the sake of it. Avoid unsupported unless and until you are sure that your back is perfect. Your back may not be one of its best features, when you carry love handles and has excess fat, in which case it makes sense to show your back when you know you can not see so well.
Hope these advice can help you,have a good time.