Is a seamstress who makes covers for chairs used in un-Islamic weddings or weddings that involve evil acts sinful, and is the money earned from that unlawful?

Sewing clothes and covers to be used for forbidden things is not permissible, such as sewing curtains for dance halls or tight clothes for those known to wear them in front of non-mahram men. The principle is: "It is forbidden to sell, manufacture, or contract for any work that aids in disobeying Allah," based on His statement, the Almighty: (And cooperate in righteousness and piety, but do not cooperate in sin and aggression). Any garment that is overwhelmingly likely to be used to aid in disobedience, it is not permissible to sell or sew it. Accordingly, sewing covers for wedding chairs where sins are committed is a forbidden act, and its earnings are also forbidden. Repentance is obligatory, and the received wages must be given in charity.