I would agree about a lack of kilt-wearing in N. America in the period mentioned. Highlanders emigrating in the decades after the `45 were coming from Proscription-era Scotland: no highland dress allowed except for soldiers in Highland Regiments. So, they'd be coming over in 'normal' clothes, and wouldn't find anyone here producing tartan kilts or plaids....

In my many years of 18th C. reenacting I've noted a lot of 'wishful' thinking on the part of folks wanting desperately to transplant civilian kilt-wearing to N. America for the colonial wars periods. Basically, if you're not portraying a Highland soldier, forget it. (An exception is Oglethorpe's highland settlers in 1730-40's Georgia. They wore highland dress, but that was pre-Proscription.)

You can 'never say never', and there were probably scattered kilt-wearers in the settlements, but it's not a garb utilized by frontiersman, longhunters, rangers, mountainmen, etc. Lots of period descriptions of these men exist, and none of them mention kilts....