When are the formal uniforms, which look like civilian evening dress, worn?
There are two formal uniforms: Formal Dress and Dinner Dress. The Formal Dress Uniform may be worn at official formal evening functions when male civilians normally wear white tie. The Dinner Dress Uniform is worn at official functions when male civilians would wear black tie attire. The Dinner Dress Uniform must conform to the appropriate season, that is, the Dinner Dress White Jacket and Dinner Dress White uniform are worn in summer months only.