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.
Black tie is the second most formal dress code and is typically reserved for evening weddings. Despite what its title may suggest, black tie does not mean you must wear black, although traditionally men should wear a black tuxedo and a bow tie. Black tie appropriate attire for women can be an evening gown of any colour.
Many people wonder what black tie really means, as there are many variations. These include black tie optional and creative black tie (creative black tie is simply black tie with the allowance of splashes of colour and unique accessories).