Some examples are bigamy, theft, treason and incest. They tend to reflect the changing patterns and ideologies in a society. Quite often they are an avenue of expression in modern society. Fashions are those mores that permit a latitude of variation around a major norm. Fashions are widely accepted in a society and are subject to individual expression.
Fads are a sub-type of fashions.
They generally come and go very quickly, usually having an irrational and intense fascination. These often reflect periods of stress in society or are used as a statement of social conditions. They are deliberately formulated rules of behavior that are enforced by a special authority. They are formally sanctioned and often strongly enforced. They could also be defined as webs of organized relationships among individuals and groups that define mutual rights and responsibilities.