The information came from The Ladies Treasury magazine from 1882.
The item says that St. Francois Regis is the patron saint of lace-workers and how he became such is as follows:
In January 1640 the town authorities of Le Puy, France, posted up, at the four corners of the streets, an ordinance of the Parliament of Toulouse, forbidding under pain of heavy fines, all persons, of what degree soever, to wear lace upon their garments after the seventh day of the month of February following.
This naturally caused a great sensation in Le Puy and Velay among the merchants, as well as the unfortunate women who existed only by the proceeds of their lace making. They appealed to the great preacher of the day, Jean Francois Regis who procured a revocation of the edict and consequently when he became canonized, he became the patron saint of lace.