"Uniforms of the American Revolution" by John Mollo and Malcolm McGregor is a reference that I use, as well as Osprey numbers on Continental Army. Another that I have in my library is "The American Soldier: US Armies in Uniform, 1755 to the Present", by Philip Katcher (edited), published in 1990 by Osprey. It's a collection of illustrations and captions from various Osprey "Men at Arms" volumes on the American Army for the date range stated, including Confederates for the Civil War.
I apologize for asking, because I'm not trying to be a smart-aleck, but have you searched the web at all? That's something else that I usually do, if I'm looking for info on specific units.
The books I cite do not lay out info as is often done in books on European armies, that is, there are no tables showing the facing colors for all Continental regiments, or listing the details of their flags. For one thing, the information hasn't been collected quite as systematically as it has for the Prussian army, say, or Napoleon's army. For another, for both the French and Indian War and the Revolutionary War, some of the source info is lacking, in comparison with studies of other armies. I just mention that as a disclaimer.
A good source of illustrations is the Anne S. K. Brown Military Collection at Brown University. It's available online at
http://library.brown.edu/collections/askb/
Another source is the Company of Military Historians, whose main website is
http://www.military-historians.org/ The Company publishes illustrations to subscribers, and over the years, those have included plates by illustrators such as Lefferts, whose depictions of American soldiers have been published in various outlets. You can search the Company's site. I just tried a search on "2nd new york infantry"; most of the pages returned are for Civil War references, but this page was also returned:
http://www.military-historians.org/company/plates/images/US.htm#rebel It doesn't look like there is an example of the 2nd New York, but you can see the kind of materials available.
Hope that helps, prost!
Brad