Hijab is one of the requirements of ladies and gentlemen in Iran as an Islamic country and the new form of hijab in Iran today is not as strict as it was in the past years. This kind of cover in Iran has a very old history. The ancient texts, as well as observation of documents, prove that Hijab has a very ancient root in Iran. Hijab is much different for men. Men only need to avoid wearing short trousers in public places and they have no other obstacles to choosing their clothes. But about the women, it is a bit different, and they have to use a special type of Hijab including Chador and scarves. This type of cover is different in some places also for different people. In small and religious cities, Chador and long Manto is much more common. In the bigger cities, especially the tourist ones such as Tehran, Isfahan, Shiraz, and Yazd, this social law is less color., and the type of women's cover is very different from other cities.
Hijab is a mandatory Islamic law, especially for women, and they must cover hair and body. This does for women by Chador and Manto, which is more common in religious places as a traditional outfit, but Manto is also appreciated by young ladies. The coverage and Hijab are not completely done by all people, and due to the age, social status, and other personal characteristics are very different.
There are some minimum requirements for tourists women dress-code in public places but generally, they are freer when coming as tourists.
About Hijab you can notice these recommendations:
Color: It's a completely false belief, that you should select just black or dark. There is no limitation, you can use all light colors.
Head: Hair should be covered. It does not mean you shall have a tight scarf around your head. Don't worry, It is very usual that some parts remain out of the cover.
It's quite acceptable for women to keep their hair on their faces. The scarf is the most common covering for the head and is called "Roosari" in Farsi.
Body: you should cover them just with some things. you can wear trousers - either jeans or if visiting in summer, something loose and cotton is best. Arms should not be bare.
Legs & feet: Feet can be bare and you can wear sandals. Tight jeans are no problem.