Wearing a belt during ihram is not a problem

Question: What is the ruling on a pilgrim in the state of ihram wearing a waistband (belt) to keep his money in? Is it permissible for him to do so, or is it considered a sewn garment that is not permissible to wear?

Answer: There is no harm in wearing a belt or the like, and likewise a belt or a cloth for tying his lower garment and keeping his needs, such as money and other things. And success is from Allah.