I'll correct myself, if I may. I found a reference online from Google book search that appears good and states that as of 1780, the 42nd grenadiers were indeed wearing bonnets. The picture from "Don Troiani's Soldiers of the American Revolution" By Don Troiani, James Kochan shows a grenadier wearing what appears to be a Hummel or Kilmarnock bonnet. http://books.google.com/books?id=ftm...age&q=&f=false