Iran before the Islamic Revolution of 1979 was quite a different country from the one we see today. It was secular, Western-oriented and allowed a certain amount of cultural freedom.
It might be shocking today, but women of that time also took a modern approach when it came to fashion. They would dress up just like their Western counterparts and would even show some skin. These old magazine scans give us a rough idea of what a woman could wear at that time.
Today the women’s dress code in Iran is way more conservative than back in the ‘70s; now, they need to cover their hair, necks, and arms. Nevertheless, Iranian women are generally stylish and tend to choose colorful outfits.