All of this information is spot on. I wrote a book some years back titled, "Cadet Gray and Butternut Brown" on CS uniforms, where they got them and why they looked like they did through 4 years of War. It would change every year based on supplies available, donation, then imports like cloth and buttons, and what State you came from. North Carolina and Georgia Tennessee and Alabama all supplied clothing to their Volunteer Regiments-- some through 1864. If you have to pick the period or year you wish to represent and what campaigns. A generic uniform according to regulation is fine-- What your research uncovers might change that.