Iranian newspapers have printed a list of moral vices that the police are targeting, including wearing make-up and hats instead of headscarves.
The police say they will also suppress "decadent" films, drugs and alcohol.
The police are warning they will deal seriously with any women who dare to wear short trousers, skimpy overcoats or skirts that are revealingly transparent or have slits in them.
During the reformist period, Islamic dress restrictions eased dramatically in Iran, with women wearing bright colours, following Western fashions, and pushing the limits in an attempt to express their individuality
Terrorising people by quarrelling and feuding in public
Wearing decadent Western clothes and displaying signs and insignia of deviant groups
Procuring drugs and alcohol