2006 Iranian sumptuary law hoax
On May 19, 2006, the National Post in Canada published an article titled "Iran Eyes Badges for Jews: Law would require non-Muslim insignia" by Iranian in exile Amir Taheri alleging that the Iranian parliament had passed a sumptuary law mandating a national dress code for all Iranians, Muslim and non-Muslim alike. The article went on to say that non-Muslim religious minorities in Iran would be required to wear "special insignia": yellow for Jews, red for Christians and blue for Zoroastrians.
Source: Wikipedia — 2006 Iranian sumptuary law hoax (CC BY-SA 4.0)