I wasnt planning on getting to crazy. Just maybe have a feather or two in the hat. Maybe wear a pair of mocs. Maybe a small mirror and some vermillion/ or red ochre.
Besides the research...the other hard thing is getting decent quality clothing. Just a hat can run over a hundred dollars. ( I suppose I could wear a turban but that would really not be so subtle)I have a hunting shirt of linen...but may have to.be modified to fit into a mid 19th c setting.
I think maybe perhaps your idea of how they looked during the war may have been a little off by the sounds of it. No offense.
If I were to recommend how to go about it, this would be my approach:
Clothing
1. Standard wool or jean Civilian trousers
2. Vest
3. Regular brogans. Moccasins were no longer a thing amongst tribes in modern Oklahoma.
4. A colorful civilian frock coat. As seen by the pictures, and there was a name for that then fashion amongst the Cherokee I've forgotten, but South Union Mills just came out with a banyan that I'd say could fit the bill. That Cherokee coat would be a custom item however.
5. Headwear, a regular citizen hat of any kind, or Cherokee turban
6. Optional, a white jean CS jacket would not be out of place, OR even a Federal sack coat.
7. STAY AWAY FROM a Cherokee "ribbon shirt"!!! These are popular for people portraying Cherokee, and even other tribes, BUT they didn't become a thing until AFTER 1900!!! People love them for re-enactments and LH's but have no place historically in anything pre-1910.
Weapons and accoutrements:
Rifles
1. Southern Poor Boy rifle
Going by accounts I've read they were seen, in percussion or flint, but flint was least common and are not typically allowed at re-enactments, but good for LH's.
2. P1853 "Enfield" rifle-muskets
Pretty common capture along with other infantry weapons
3. M1861 Springfield
See number 2
4. Austrian "Kammerbuche" M1849
I most likely missed spelled that, but they were issued to the Federal "Indian Home Guard" regiments at a few points early in the war, and natives would desert and join the other side ALL the time. They were not the most loyal or dependable soldiers many of us would like to believe…
5. Double-barrel Shotgun
Hands down those muzzleloaders were probably the most common gun period in they're ranks.
Common reproduction "Hawken gun" are historically inaccurate for any portrayal CW wise.
Handguns:
Handguns were from all I've seen very rare in CS Indian ranks, until after Waitie captured the J.R Williams in Oklahoma's only naval battle, then there were Colt M1860 "Army" revolvers all around as there was a large shipment! Before that I've only seen mentions of pocket revolvers and of a Colt Dragoon or two.
Accoutrements:
Standard civilian weapon gear, and of some captured Federal gear. Infantry gear on the captured would probably be more common.