Basically the outfit will look somewhat like this though I'll be going with somewhat different colors, the outfit Viggo's wearing;
Kinda the Tombstone look.
View attachment 57335
Roughly the same period. Already have a persona (history) worked out. Civil War with Syke's Regulars, V Corps, rising to the rank of Major, a year afterwards out west fighting Indians before resigning my commission to hunt buffalo. Back to scouting for the Army in the southwest then working as a railroad boss laying track from Galveston up to San Antonio and now have a freight company out of San Antonio supplying the Army in El Paso.
As for weapons I have a double barrel muzzleloading shotgun, an 1860 Calvary model Colt revolver, an 1859 Remington Revolver and I'm hoping to pick up an 1859 Sharps conversion to 52-70 (one of the favorite buffalo guns of the time).
If you look carefully you'll notice the gun belt he's wearing is not the gun belts you see in Hollywood movies, those weren't invented until the 1930s (I think). Basically it's a wide leather belt with an early slim holster that has a belt loop on the back, The other belt (on top) is simply a cartridge belt.