Fatwa

A fatwā (Arabic: فتوى‎; plural fatāwā فتاوى) in the Islamic faith is a nonbinding but authoritative legal opinion or learned interpretation that the Sheikhul Islam, a qualified jurist or mufti, can give on issues pertaining to the Islamic law.

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The Maraji' have generally ruled that wearing things like leather belts in salat is not allowed if the leather is not slaughtered in an Islamic way. See Islamic Laws of Ayatullah Seestani's Tawdhihu'l Masa'il p. 160.