On his knee, is that, by any chance, a sewed on patch? Makeshift uniform repair?
Yep, we have 3 sets of trousers.
Fancy, this is gonna be just so awesome!
Just a little FYI
You'd be surprised how often this happened in reality. Linnen and cotton (most trousers were made of this at that time period)teared up eventually if you were in the first line and had to crouch down constantly when firing volleys. That's why the use of woolen over-the-knee gaitors started to become more common in this era, and the British eventually switched from cotton to woolen trousers in the Napoleonic Wars.
No, no, no. Not in the 1770s-80s. Cotton was scarce and expensive in the colonies. People did wear it, but was not common to own. Soldiers would definitely not. I could see cotton being common in the early 19th century as that is the period when the industry picked up, but soldier's breeches at that time were made of linen,wool, broadcloth, or (preferred by the continentals) buckskin, elk, or sheep skin.