A dress code is a set of rules governing what garments may be worn together and in what setting. Examples of dress codes are combinations such as "smart casual

Smart casual

Smart casual is a loosely defined dress code, casual, yet "smart" enough to conform to the particular standards of certain Western social groups....

", or "morning dress

Morning dress

Morning dress is the daytime formal dress code, consisting chiefly for men of a morning coat, waistcoat, and striped trousers, and an appropriate dress for women...

". A classification of these codes is normally made for varying levels of formality and times of day. In traditional Western dressing, for men the more formal dress codes, such as "black tie", are highly codified with essentially fixed definitions, mostly unchanged for more than fifty years, while the more casual classifications change very quickly, and a worldwide or widely relevant discussion is impossible.