Words. Details can be maddeningly elusive in the past. The Continental Army coat started out well enough. There were good sources that helped shape the color and style of this coat. Then there weren't. Always good (painful) to check footnotes. Construction of the coat has passed the point of drastic changes. Since details are often few in letters, orderly books, and journals, the meaning of words becomes key. There are coats and there are jackets.
waistcoat. Wrapped around the right edge of the canvas interfacing is the red strip of a lapel. Hooks and eyes get fixed at top right. Only a skirt lining in this coat.
The America Southern army was nearly destroyed in 1780 at Charleston. General Gates did his best to destroy the replacement Army two months later. Gates replacement, General Greene discovered a dearth of roads and wagons in the Carolinas. States like Maryland struggled to get clothes to their nearly naked troops.
"Regimental Coats" arrived in October, and were handed out immediately. In Virginia, good old Baron Steuben rushed supplies, arms, and men South. These fellows wore "jackets with sleeves."
Always nice to know what they were supposed to have. There is period imagery of British Lights with square cut jackets as early as 1777. This is probably what Greene is talking about. No lapels, no skirts, "with sleeves" implying that sometimes they were without like a waistcoat. Blue and red is a safe choice for mid-Atlantic Continentals, but not sure. Already ideas are forming for another coat.