The Messenger of Allah wiped over his leather socks and his head cover (i.e., over the Imamah). (Using translation from Ibn Mājah 561)

أَخْبَرَهُ أَنَّ رَسُولَ اللهِ ﷺ قَالَ امْسَحُوا عَلَى الْخُفَّيْنِ وَالْخِمَارِ