فَإِنْ سَجَدَ عَلَى كَوْرِ عِمَامَتِهِ، أَوْ عَلَى فَاضِلِ ثَوْبِهِ: جَازَ.
Meaning: If one prostrates on the fold of one’s turban or on the surplus portion of one’s garment, it is valid.
Kawr al-imamah refers to a wrapped fold of the turban and fadl al-thawb to an extra portion of clothing. The support beneath the forehead must still allow an actual prostration.