Ihram Belt

Prevents the lower ihram from falling down.

Make your Hajj and Umrah more Comfortable.

It is permissible to wear a belt over the ihram for the purpose of holding the ihram or keeping money and other needs.

There is nothing wrong with this even if it is stitched. This is because what is forbidden is stitched clothes that are habitually worn when one is not in the state of ihram.