Is it permissible for the questioner's wife to help his aunt sew revealing dresses for brides?

It is permissible for your paternal aunt to sew dresses and for your wife to assist her, provided that the dresses cover what must be covered in front of women, which is the area between the navel and the knee, and are only worn in front of women. If one of these two conditions is not met, then it is not permissible; because the ruling on sewing and assisting in it branches from the ruling on wearing them. And any garment that is suspected of being used to commit a sin, it is not permissible to sell or sew it for someone who will use it for sin.