The "wāṣilah" (the one who adds false hair) is she who connects her hair with another’s hair or with something else. The "mustawṣilah" is she whose hair is connected at her request. This is not permissible due to the report, for Aisha (may Allah be pleased with her) narrated that a woman came to the Prophet (may Allah bless him and grant him peace) and said: "My daughter is a bride, and her hair has become sparse (126), so may I connect it?" The Prophet (may Allah bless him and grant him peace) said: "The wāṣilah and the mustawṣilah have been cursed." (127) Therefore, it is not permissible for a woman to connect her hair with other hair according to these hadiths, and because of what was narrated from Mu'awiyah that he brought out a clump (128) of hair and said: "I heard the Messenger of Allah (may Allah bless him and grant him peace) forbidding the like of this, and he said: 'The Children of Israel were only destroyed when their women adopted this.'" (129)

As for connecting it with something other than hair, if it is to the extent by which she fastens her hair, there is no harm in it because the need calls for it and it is not possible to avoid it. If it is more than that, there are two narrations: One of them is that it is disliked but not prohibited, based on the hadith of Mu'awiyah specifying that which connects it with hair, so it is possible to interpret that as an explanation for the general phrasing, while the dislike remains due to the general nature of the phrasing in other cases.