Morning dress is the formal dress code for day attire, consisting chiefly of, for men, a morning coat, waistcoat, and formal trousers. Men may also wear a popular variant where all parts (morning coat, waistcoat and trousers) are the same colour and material, often grey and usually called "morning suit" or "morning grey" to distinguish it considered properly appropriate only to weddings and horse races.
The name originated from the practice of gentlemen in the nineteenth century riding a horse in the morning with a cutaway front, single breasted morning coat..The modern twentieth century morning dress was originally a more casual form of half dress, but as the nineteenth century progressed it gradually became acceptable to wear it in more formal situations instead of a frock coat. In the Edwardian era it took over in popularity from the frock coat as the standard daytime form of men's full dress. When it was regarded as a more casual coat, it was common to see it made with step collars notched lapels in American English , but as it took over from the frock coat in formality it began to be made with the more formal pointed lapels.