Iran has a strict dress code and this is one of the main concerns of women travelling to Iran. Most importantly have a shawl or headscarf in your luggage. I have heard nowadays your flight also checks about this, You MUST wear this when you get off the plane and are officially in Iran.
You must wear a scarf for the duration of your stay (except in your hotel room) and loose clothing that covers your body. But let's be clear: you do not have to wear a burka or anything that completely covers you. When you arrive, you will soon see that the reality is very far from the stereotype. Iranian women are elegant and proud of their appearance - fashion is a way to stand out and stand out.
Tourist dress code in Iran.
The "morality police" you've heard of do exist in Iran but do not always chase away foreign visitors, so do not worry too much about it. If anything, you'll just get a polite mention. Visitors have a little more flexibility regarding the rules.
Don’t worry if your scarf falls, just put it back. This will not cause you any problems, Many Iranian women wear it a little loose and halfway over the head because show a little hair is granted.
The tops should be loose and the three-quarter sleeves are ok - a little more comfortable in hot weather.
For tourists, leggings with a long, loose-fitting blouse are accepted. Though, in the conservative cities such as Qom Kashan and Yazd, you will get fewer stares if you dress more conservative.
Sandals are totally fine and accepted.
Worried about not having enough appropriate clothing? Do not worry, as soon as you arrive in Tehran or even Shiraz (if you arrive there), go to the bazaar and the local markets and shop. There are many things to buy.
One thing I always recommend is to bring your long dresses which covers your ankle and just wear a simple jean jacket or any loose dress on top of it.
For men, it's easier. You dress in much the same way as in Western countries, with the exception of short shorts, super short sleeves and too tight clothing.