Howdy Will,
Better late than never!
My Cas City Cowboy Profile is my Originals persona. This is a persona that I have used for 25 years. For CAS, I simply picked the year that I wanted to start my portrayal and then back dated my birth year to fit. I chose 1875 to allow the use of a SAA Colt and an 1873 Winchester. I chose to be a Mexican War vet. who did not participate in the 1861-65 war. I don't know much about the ACW and want to keep it that way. I include at trip to Europe and the Orient to allow a more diverse wardrobe, being interested in clothes at least as much as shooting.
I chose a 3 piece sack suit for my Originals outfit. Added a derby, brogans. band collar shirt and a plain gun belt and holster. There is a picture of Bill Hickock wearing this type of shirt and a vest without lapels, which I also wear as part of my suit. Another photo is of a reunion of men who fought in the battle of San Jacinto which took place in 1871. Of the about 20 men in the picture 5 - 7 were wearing band collar shirts, vests without lapels, and brogans. Pictures of bowler hast are no problem. As a re-enactor, I found this process interesting and not at all difficult.
Hope that this is what you wanted Will!