Is it permissible for a deceased woman to be shrouded in the izar (lower garment) of her deceased husband, due to the love between them?

It is best to supplicate frequently for your husband, asking for mercy and forgiveness for him. There is no benefit in shrouding in a husband's clothes; white is preferable, as the Prophet said: "Wear white clothes, for they are the best of your garments, and shroud your dead in them." The shroud should be from the deceased's wealth, and the husband's Izar (loincloth) is an inheritance that should not be used. There is no objection to preparing the shroud beforehand from your own private wealth. It is best for a man to have three new white garments, and for women, five garments for modesty. So there is no need to shroud in the husband's Izar due to the lack of the required specifications.