As we all know, when we get married, as women, we should buy something for our parents-in-law. This is a polite question, but there is not much definition of what to buy, because everyone has different ideas and every parents-in-law likes different things. As a daughter-in-law, if you want to buy something for your parents-in-law, you might as well ask your husband first to see what they like, and then you can buy it. If you don't want to ask, then you can buy something more conventional, such as clothes.
It is not mandatory to buy a bag for both mothers when they get married, depending on their personal wishes, because it represents the wishes of both parents. Gifts are always faint and affectionate, and parents don't really want expensive gifts.