Will the tailor be sinful if he sews a garment that its owner uses for vanity?

It is forbidden for a tailor to cut and sew a garment for someone who intends to use it out of pride or for someone whose garment extends below their ankles, because doing so constitutes assisting in sin. However, if a tailor sews garments and offers them for sale in a reasonable manner, and the buyer uses them for pride without the tailor's knowledge, then only the one who acts proudly is sinful.