Islamic Interpretation of Dreams (Ibn-i Sirin):

(Under garment; Underpants) In a dream, a slip represents a free woman.

A woman wearing an underwear slip in a dream denotes marriage.

If she is wearing a flashy red slip in the dream, it means that she will be accused of wrongdoing.

If a respectable woman adventures with her slip into the streets in a dream, it means that her misfortune will become the talk of the town.