All four schools agree that women should not wear a niqab (a face veil that is tied or fastened) during ইহরাম, based on the hadith prohibiting it. However, scholars unanimously permit draping a cloth from the head that falls over the face when non-mahram men are nearby. This distinction between wearing a specific face garment versus draping loose fabric is the key scholarly consensus.
The ruling on face covering during ইহরাম is based on the hadith narrated by Ibn Umar, in which নবী করীম (সাল্লাল্লাহু আলাইহি ওয়া সাল্লাম) said: 'The woman in ইহরাম should not wear a niqab nor should she wear gloves' (Bukhari). This hadith prohibits two specific garments during ইহরাম: the niqab (a face covering that is tied, fastened, or constructed with openings for the eyes) and gloves. The scholars discuss what alternatives are permitted while maintaining this prohibition. The key scholarly insight, articulated by Ibn Taymiyyah and others, is that the prohibition is against wearing a garment specifically designed for the face, analogous to how men are prohibited from wearing garments tailored to the body during ইহরাম. Covering the face with unstructured fabric that is not a specific face garment is a different matter.
The Hanafi school holds that a woman should not allow fabric to touch her face during ইহরাম. If she needs to cover her face, she should use a frame or visor that keeps the fabric away from the skin. However, some later Hanafi scholars relaxed this if necessity requires it. The Maliki school generally follows a similar position, preferring that fabric not touch the face, though they allow it for concealment from men. The Shafi'i school permits a woman to cover her face with fabric as long as it is not a niqab — draping a cloth from the headscarf that falls over the face is allowed, even if it touches the skin. The Hanbali school, particularly as explained by Ibn Baz and Ibn Uthaymeen, permits and encourages women to lower their headscarf or a separate cloth over the face when non-mahram men are present. This is based on narrations from Aisha and other female companions who described covering their faces during ইহরাম when male riders passed by.
The practical application for women today is straightforward. Do not wear a niqab during ইহরাম — the face veil with eye openings that is fastened behind the head. Instead, if you wish to cover your face (whether habitually or due to the presence of non-mahram men), drape your headscarf or a separate piece of fabric from the top of your head so it hangs loosely over your face. Many women use their khimar's longer front panel for this purpose. If you are in a situation where no non-mahram men are present, you may leave your face uncovered. If the fabric touches your face, the majority of scholars (especially the Hanbali and Shafi'i schools) do not consider this problematic. There is no fidyah (expiation) for momentarily or accidentally wearing a niqab during ইহরাম if you remove it promptly upon remembering. Consult your scholar for guidance specific to your madhab and circumstances.