Doc
I'm way newer here than you (in-fact Reg. just today) but I'm not new to Reenacting or CAS.
I started reenacting in the early 70's ( reenacted mounted cavalry some 28 years both impressions of CW , War of 1812, Trapper Era , Creek War ,Seminole War, Tex/Mex. Indian Wars, even Span/Am)
When I started with CAS in the mid-nineties is was just an extension of the hobby.
I used and mix and matched bits of the various uniforming or buckskins (winter) for CAS. My persona was a retired cavalry major.
Now with a renewed interest in the dark side ,using my C&B & Open top conversions ( Instead of Ruger Vaccaro's)
We have a guy that made up a complete Prison inmate persona (from Yuma ) circa 1880's
Several Reb's and a few Span/Am Rough Riders , even a Scot Highlander in Her Majesty's Service (Queen Victoria).
Cowboy Dress from working to Sat. matinee.
What you got is gonna be fine