Huh, yes. It wouldn't be until 1779 that Washington designated a blue uniform. Nothing was official until then. It was very loosely organized and consisted of whatever they could bring together, this included green, brown, buff, and so on, even red. Your source refers to the post-1779 efforts to standardize the uniforms by Washington. Blue fabric was in short supply.
What Type of Uniforms Did Revolutionary War Soldiers Wear? One of many sources on the subject. Please bear in mind I mean no ill will towards a contrary stance, I am just providing information I have from years of research as a degree-holding historian (whatever you want to think of that!
).