Find a copy of the Troiani painting of Pelham at Fredericksburg. Short jackets piped in red. Not much red on Pelham either. Great look, works for the whole war.
Does your unit have a uniform standard? A period pic or documentation? Find that out before you press on!
My early war confederate impression shows in my avatar. Yankee shell jacket, 1859 US artillery forage cap, jean wool trousers! Red in it, but Federal in nature