The ruling on wearing a Strap or Belt or Pouch Belt
Question :
What is the ruling on wearing a belt for the Hajj pilgrim who is a Muhrim (i.e., in Ihram) in order to keep his money in it? Is this permissible for him or is it considered a stitched garment that is not permissible to wear?
Answer:
There is no harm in wearing a belt and things similar to it. Likewise, a strap or a handkerchief for tying one's waist garment and saving one's needed possessions, such as money and other things, is allowed. And success is from Allâh.
Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Page 128