As far as I know the 42nd regiment wore the Govt. sett during both the 7 Years War & the American Revolution. However, there was also the 78th regiment (Fraser Highlanders) which I have read wore the Govt. sett & also a variation of the Fraser Old sett during the French & Indian War. It wouldn't hurt to check out some of the websites of living history groups that portray the time period(s) that you want to do. Believe me, as a former living historian myself, these guys are a fountain of info & usually have links to their various approved vendors.

Zach Caselman