The only questions I can answer for you is about ribbon edging on the brims of hats and yes, it is PC for all of the 18th century for both civilian and military hats. The amount of trimming ribbon and what type/s had a lot to do with how affluent the civilian was, or what they issued to Enlisted Soldiers. Of course the Officers' hats were trimmed with much more expensive ribbon/lace and often of Gold or Silver thread lace, according to the Regiment.
I, too, am interested in replies to your questions by more informed folks on this subject.
Gus