The ruling on selling these things is subject to further discussion:
1 – If you sell these things to one who you know will use them for haraam display, then it is not permissible.
2 – If you sell them to one who you know will use them for halaal means of adornment, then it is permissible.
3 – If you do not know anything about the buyer, then it is permissible to sell to her.
The Standing Committee was asked:
What is the ruling on dealing in women’s fashions and selling them to one whom the seller knows will wear them in front of non-mahram men in the street, as he can tell from the way she appears in front of him, and as is the situation in many places?
It is not permissible to sell these things if the merchant knows that the one who is buying it is going to use it for things that Allaah has forbidden, because that is a kind of cooperating in sin and transgression. But if he knows that the purchaser is going to use them to adorn herself for her husband, or he does not know anything, then it is permissible for him to sell them. End quote.
Fataawa al-Lajnah al-Daa’imah, 13/67See also questions no. 3149, 34587, 34674
And Allaah knows best.