Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Trousers in a dream indicate a foreign woman or a maidservant. Whoever buys new trousers will marry a virgin. If the trousers are of silk, he is a man who wears the unlawful and commits debauchery.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Trousers indicate chastity and salvation from an ugly matter. Wearing them indicates a man's modesty. Whoever sees himself urinating in his trousers, his wife will become pregnant.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Trousers are interpreted as a woman. Whatever good or bad is seen in them reflects on her. Clean trousers indicate the wife's righteousness, and dirty ones her corruption.