White tie, also known as full evening dress, is the most formal dress code and is suited to an evening wedding beginning after 6pm. Men should wear patent shoes, trousers with a stripe of satin on either side, a double breasted evening tailcoat with a white shirt, a white waistcoat, and white bow tie.
Traditionally, white tie attire for women stipulates that a ball gown which exposes decolletage must be worn. Evening length gloves are also required depending on the event, and tiaras may be worn by married women only. In a modern context, white tie for women requires a ball gown.
The formal dress code is located somewhere between cocktail and black tie. For the ladies this dress code requires a short or long formal dress, a pantsuit, or dressy separates. For men, a dark suit, white shirt, and conservative tie is appropriate. Men can opt to wear a tuxedo if they wish, as the formal dress code is really another way to describe black tie optional.