That’s a good one. Washington’s uniform is pretty amazing too: http://revwartalk.com/George-Washington-Items/george-washington-s-uniform.html
While the coat dates post-war, it’s still a very cool historical piece.
For unique, this Hudson River chain piece is interesting: http://revwartalk.com/Rare-Unique/hudson-river-chain-link.html
It’s wild imagining they constructed (two I believe) huge chains that stretched across the water to prevent British ships from sailing up.