What is the waiting period (iddah) for a woman whose husband has passed away, what are her obligations, what should she avoid concerning clothing, meeting people, and leaving the house, and what are the necessities that permit her to violate these restrictions?

The woman whose husband has passed away observes an 'iddah (waiting period) of four months and ten days if she is not pregnant. If she is pregnant, her 'iddah concludes upon childbirth, as was established concerning Subai'ah al-Aslamiyah. She is required to stay in her home, refrain from perfume and adornment, and should not leave except out of necessity.