What is the ruling on covering a woman's feet in prayer?

The questioner : Regarding covering a woman's feet in prayer, what is the ruling?

The Shaykh : When she stands, she must wear a long shirt that covers her feet. If the soles of her feet are exposed during prostration, for example, there is no harm in that. However, if her garment exposes the tops of her feet, that is not permissible, because the correct opinion among scholars is that a woman's feet are 'awrah (the part of the body that must be covered). Therefore, the Prophet (peace and blessings be upon him) ordered the woman to lengthen her garment by a handspan from above the ankles. When the question was raised that a breeze might come and expose them, he said to add another handspan, making the total length an arm's length, and not to exceed that. This is very clear evidence explaining the noble verse which says: Because this adornment referred to the anklets that hang down to the level of the ankles, or below them if they are wide, and that this should be covered by the garment.