Leftover material after sewing a garment

Q: A person does sewing as a business.

1. Can they ask permission from their customers to throw away the very tiny scraps of their fabric. eg. from overlocking and trimming seams etc?

2. Is it okay if she notifies them afterwards that some of the scraps might have been thrown away or should she tell them from the beginning that its possible that some of their fabric/cotton(scraps and shards of fabric eg.from fraying/ cotton from unpicking when altering etc.) could possibly be thrown away or does she have to notify them at all as sewing usually does entail all these? (usually she tries to return everything but sometimes very tiny pieces remain so notify afterwards)

3. Does she have to decide for each customer, whether she will sew for them or not, from what they are wearing at that point or from what they seem to be from what they speak (if she doesnt know them personally) or if she knows them to be parda concious or not and then let them know whether she will sew for them or not, or will a clear notice that all outfits(i.e. which she sews atleast) should be worn in accordance to shariah, suffice? Please give any other advise which might also be important to take note of when doing business.

Is the husband liable to provide for his wife and children if they are living separately?

Q: My sister is in Canada, married with 2 kids (age 11 and 2), and as per her marital difference and diffculties they both husband wife decided to live separate for few months to see if they can bring sulah in between them. In the mean time, the kids staying with the mother. As, per sharia law what will be husband and wife's responsibilities as far as naan/nafkhaa is concern for mother and kids? Does mother have to go to work to take care of house and kids where she will be living for this few months? Or husband will have to provide something from his side to support two kids and wife?

Making cuts on one's body

Q: Want to ask you that there is a person he or she self harms means he or she makes cuts on his or her body. Everytime he or she says that it's the last time but the next time he or she does the same thing again and again. What does islam says about this? Will Allah Ta'ala forgive? What will be the punishment for it?

Explanation of the statement of Hazrat Umar (radiyallahu anhu), "Do not let the prayer of a man deceive you nor his fasting..."

Q: What is the meaning of this narration: Sayyiduna ‘Umar ibn Al Khattab (radiyallahu ‘anhu) said: “Do not let the prayer of a man deceive you nor his fasting. Rather look at the truthfulness of his speech, his trustworthiness whenever he is entrusted, and how he acts whenever he is given wealth/power.”

Imams Musaddad, Bayhaqi (rahimahumallah) and other Muhaddithun have recorded this statement of Sayyiduna ‘Umar ibn Al Khattab (radiyallahu ‘anhu). Hafiz Ibn Hajar Al ‘Asqalani (rahimahullah) has declared the narration authentic. (Shu’abul Iman, Hadith: 4898 and Al Matalibul ‘Aliyah, Hadith: 2631)