Is it permissible to pray in an abaya that is internally soiled with feces when no other garment is available and one is traveling?

Prayer is not permissible with ritually impure clothing. If one prays with such clothing, knowing of its impurity and being able to remove it, their prayer is invalid and must be repeated, because the ritual purity of the body, clothing, and place is a condition for the validity of prayer. If the inner clothing is impure, it must be removed, and one should pray with the outer clothing that covers the entire body. The minimum permissible clothing for a woman in prayer is a thick, ample outer garment (dir', "shift dress") that covers the tops of the feet, and a head covering (khimar) that she puts on.