2. Tibi Open Back Dress

Price: $375.00 at net-a-porter.com
While it may not look like much from the front, this dress has a daring low-cut back. It comes in a rich ruby hue and is made from silk crepe de chine. The design features puffed cap sleeves, a fitted waist, and is fully lined. Show off the open back partry dresses such as this by wearing your hair up or gathered to one side.