Wearing a belt to secure the izar (lower garment) during الإحرام is جائز عند جمهور العلماء. الشيخ ابن باز explicitly ruled that using a belt, cord, or similar fastener to keep the izar in place is allowed, as the prohibition in الإحرام concerns garments tailored and stitched to fit the body's contour (such as pants, shirts, and robes), not accessories used to fasten the الإحرام cloth. النبي (صلى الله عليه وسلم) prohibited the muhrim from wearing shirts, trousers, turbans, hooded cloaks, and leather socks, but did not mention belts or waist fasteners.
الشيخ ابن عثيمين similarly permitted money belts and waist pouches worn during الإحرام for safekeeping money, documents, and identification. He noted that الحجاج need a secure way to carry their valuables, and a money belt serves this practical purpose without violating the spirit or letter of الإحرام restrictions. The اللجنة الدائمة for Scholarly Research and Ifta also issued a fatwa permitting belts during الإحرام.
There is a minor difference of opinion among some scholars regarding whether the belt should be plain or whether it matters if it resembles regular clothing. However, the overwhelming majority agree that a simple belt, cord, or money belt is جائز. What remains prohibited is wearing any garment that is sewn to fit a specific body part, such as underwear or shorts under the izar.