How to dress in Iran?
Men should were long pants, and when entering places of respect long sleeves. Women should wear a head scarf when out in public. You do not have to wear a burka, or chador. A plain head scarf covering most of your hair (fringe exposes is fine) is needed. Covering your bum is also advised. A shawl or light material will do. All headscarfs and materials are available in the bazaars and can be made up within minutes. In fact is worth getting something made up just to chat with the local women about what they think about it all. Have a look at the student and see what they are wearing to see how iran is changing. T shits, jeans and designer everything. T-shirts etc are fine. Being a tourist you will get away with a lot.