I'm an 18th Century Reenactor...French and Indian (Seven Year's) War and American Revolutionary period. My question is not necessarily specific to Scottish attire...but I am pretty sure that scottish gentlemen would have worn the ubiquitous cocked hat (known by many as a tricorn) as well as the bonnet. I am interested in answers for either style of headgear. Here is my question:

I've noted that, in America, the style of the cocked hat transitioned from a relatively triangular shape in the 1750s to a style with a more less pronounced front brim protrusion (creating more of a bicorn effect) during the 1770s and 1780s. I've also noted that rosettes adorning that headgear (at least military hats) seemed to have transitioned from a bow-tie shaped rosette during the 1750s to a round rosette during the American Revolution (like Robert posted pictures of today). Does anybody know if there are specific styles worn by military versus civilian and is there any style that's specific to a period or country?