Source: The Great Interpretation of Dreams (Ibn Sirin)
A belt in a dream indicates resolve and determination in matters. Tightening it indicates preparing for a journey or an important matter.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A belt indicates a child or a servant. Whoever sees himself tightening his belt, his affair will become strong.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A belt is interpreted as money. Whoever sees himself wearing one will gain money.