This is related by the five and by al-Hakim who says that it is sahih according to Muslim’s conditions. Al-Khattabi explains: “As-sadl is to lower one’s garment until it reaches the ground.” Al-Kamal ibn al-Hamam adds: “This also applies to wearing a cloak without putting one’s arms through its sleeves.”
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Sadl means to lower one hands and not to put them on the chest. It can also mean to lower one’s hair over the forehead and to rap the dress round the body while having the arms and hands inside like a mummy.
As for covering the mouth, this is forbidden for both men and women without a legitimate reason as this is the doing of the people in Jahiliyah.
And Allah knows best