also "hijab"/chador is not something new in Iran, it has always been even before Islam.
Chador has ancient origins, at least from
Achaemenid times.
[1] A chador is a full-body-length semicircle of fabric that is open down the front. This cloth is tossed over the woman's or girl's head, but then she holds it closed in the front. The chador has no hand openings, or any
buttons, clasps, etc., but rather it is held closed by her hands or tucked under the wearer's arms.
The earliest written record of
chador can be found in
Pahlavi scripts from 6th century, as a female head dress worn by
Zoroastrian women