We provide a full-package trip for groups, private parties and individuals which includes applying for visas, booking hotels and domestic flights, as required, providing transportation for all sightseeing visits and excursions, and assigning highly qualified national guide.
Here are some tips:

Whether you want to buy your travel cloths in Iran or not, you need to wear the following cloths as you enter Iran.

A long sleeve shirt
A pair of long pants that doesn't show your legs.
A headscarf that modestly covers your hair.
If possible wear a mantou. Mantou is a trench coat. Nowadays majority of Iranian women wear mantou as their main cover dress, when they need to go out to work or street. Some sample as below