Big Man,
I might suggest these folks for som pretty accurate reproduction clothing for the look you are after.
http://www.quartermasterdepot.com
Also for gear Jerry Lee and What Price Glory is turning out some nice late 19th, early 20th centhey accoutrements. Like haversacks, leather gear, etc. I have one of his 1878 haversacks and they are skookum!
Thanks, Renault. I've done business with both these companies before and they do have some very nice things. Too bad the shirts and pants are made for small people. I need to check to see if they will custom make some of their clothing in a real man's size.