Mr. McQueen while a stay maker himself is also importing stays from London to be sold in New York. He frequently offers in his advertisements children's packthread stays, in this posting he also details the sizing of the stays. "first, second and third size Packthread Stays". Could one assume the terms small, medium and large would apply? Also unknown to this blogger is the term "cushcats (sp) for Ladies Morning dress".
April 29, 1765 New York Gazette