What is the ruling on dealing
in items used by women for adornment and selling them to women whom the
vendor knows will wear them in order to flaunt themselves before
non-mahram men in the streets, as he can see from the way she looks in
front of him, and as is unfortunately widespread in some places?
It is not permissible to sell them if the businessman knows that the person who buys them is going to use them for things that Allaah has forbidden, because this means that he is cooperating in sin and transgression. But if he knows that the purchaser is only going to wear them for her husband or he does not know anything, then it is permissible for him to sell them.