Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Cotton in a dream is lawful money and covering (concealment). Collecting it indicates collecting money. Carding it indicates the removal of worry.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Cotton indicates a humble man. Wearing it indicates righteousness in religion and worldly life.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Cotton is interpreted as lawful money. Whoever sees himself sell it is spending his money for good.