By the 1760’s, all stitching of stays was done…

…by hand, and bones were often laid one next to the other within 1/8″ in rows, demanding quite the craftsmanship as well as hand and arm strength.  The making of stays was reserved for men because of the strength required, and also for political reasons due to tailor’s guilds.

(Extant stays: Approximate 1770 wool and linen stays fully boned)