adjacency; indeed, I found something similar in Fatḥ al-Bārī at another place, under the ḥadīth of al-Barāʾ (may Allah be pleased with him):

(Authentic) “A man came to the Prophet ﷺ with his face masked in iron…,” the report. It is narrated by al-Bukhārī and others and is listed in al-Ṣaḥīḥa, no. 2932. Ibn Ḥajar comments (6/25):

His phrase “muqanniʿ”—with an open qāf and a doubled nūn—is an idiom for covering one’s face with war gear.

That is, he means what lies next to the face; otherwise the man would not have been able to walk, let alone fight, as is obvious.

Having settled this point, let us return to our original task: naming the ḥadīth scholars who explained the khimār as a head covering—Badr al-Dīn al-ʿAynī (d. 855 AH) in ʿUmdat al-Qārī (19/92), ʿAlī al-Qārī (d. 1014 AH), al-Ṣanʿānī (d. 1182 AH), al-Shawkānī (d. 1250 AH), Aḥmad Muḥammad Shākir of Egypt (d. 1377 AH), and others. ⦗21⦘