Wearing black in Fatimiyya is generally permitted and often recommended—what makes it praiseworthy is your intention to mourn and honor the Ahl al-Bayt.
Wearing black during Fatimiyya and other mourning days for the Ahl al-Bayt, as an expression of sympathy and grief, is counted as meritorious and recommended by many religious authorities.
Wearing black in Fatimiyya is regarded as a symbol of sorrow and of renewing one’s allegiance to the Ahl al-Bayt (peace be upon them).
Important points on this subject:
Opinion of the Leader: Ayatollah Khamenei has described wearing black in Fatimiyya as an act of sympathy with the Prophet’s family and as a way to preserve religious rites; he regards it as carrying spiritual reward.
Dislike of black for men: Some reports and traditions mention a dislike (karāhah) for men wearing black. However, because the primary purpose during mourning is to show sympathy and sorrow, this dislike is generally not treated as decisive in mourning contexts.
Intention and purpose: The most important factor is the wearer’s intention. If someone wears black with the sincere intention of sympathizing and honoring religious rites, the act is considered rewarded.
Therefore, in general, wearing black during Fatimiyya and other mourning days of the Ahl al-Bayt is not a religious obstacle and is in fact regarded by many as recommended.
Wearing black in Fatimiyya signals sympathy and renewed loyalty to the Ahl al-Bayt and is viewed by many authorities as meritorious.
Although some traditions mention a dislike for men wearing black, that concern is typically set aside during formal mourning where the objective is public grieving.
Always prioritize intention: wearing black with sincere respect for religious rites strengthens the act’s spiritual value.
The Supreme Leader (Ayatollah Khamenei) has affirmed that wearing black in these days carries reward and preserves religious symbolism.
If you follow a specific marjaʿ or remain uncertain, seek a direct fatwa or ask your religious authority.