Is it permissible to wear items requiring expiation (Fidyah) during combat against besiegers, such as armor?
Chapter on What the Muhrim Must Avoid and What is Permissible for Him
Al-Mughni
Book of Hajj
Primary text
If Muslims require wearing items for which expiation is due, such as armor (dir' and mughfar), they must wear them. They are then obligated to pay the expiation. This is because wearing such items is for self-preservation, analogous to wearing them to guard against cold.