AhsanAllahu ilaykum My mother's prayer cloth (dont know what its called) covers everything when she stands. But when raising her hands or putting arms on chest, some of her arms show. (It gets covered again when arms get down). Is her salah valid?

Ustadh AbdulAziz al-Haqqan

If it shows the forearms and she instantly covers then the salah is valid but she needs to use a better cover for the next salah. But if she intentionally does not cover it then the salah is invalid.