Savvy Jack,
The outfit below was assembled over the past eight years or so – not sure if the suppliers still sell what I got from them, however worth contacting them to see if they still carry what I got back in the day.
Hat: ‘Boss of the Plains’ clone from Clearwater Hats
Shirt: band-collar shirt I got some years back from a mainstream CW sutler but can’t remember which one (sorry), it is defarbed - re-did button holes by hand and added original small glass buttons
Drawers: C&D Jarnigan – full-length domet flannel, reworked buttonholes by hand, added proper buttons, and cut off legs
Trousers: made by me from brown Family Heirloom Weavers jeancloth, modified Richmond Depot army pants pattern from County Cloth/Chas Childs to make ‘California’ pants, reproduction hardrubber buttons from the Blockade Runner, back-belt buckle from Trans-Mississippi Depot
Socks: hand-knit wool from Nancy Eddin’s Emporium
Boots: Missouri Boot & Shoe
Belts, holster, knife scabbard: made by me, got roller buckles from Trans-Mississippi Depot
If you’ve got a knack for sewing making your own clothing is a great way to go, using a period treadle machine is relatively easy and they are simple to restore (and note - they don’t backstitch, so you'll have to hand-finish). A little research on fabrics, patterns and all that jazz will yield excellent items and you can make them as authentic as you’d like. PM me if you have any questions &c on this sort of stuff.
Best of luck assembling future outfits.
YMH&OS,
Brass