Start with the M1884 uniform at
www.quartermastershop.com. Save up for the M1898. Get the leggings and other accoutrements from Coon Creek. Good folks there. A good hat can be had a
www.hatcrafters.com Leggings and leather can also be found at
www.eureka-arsenal.com The Coon Creek hat is good, as are many out there, Dirty Billy is the best, but he's expensive, cantankerous, and a long wait. (I've got one, its excellent, but I had something else to wear while I waited)
The Coon Creek pants are good, but getting a tunic to match is very hard. The QM shop stuff will all match. I use Coon Creek for shirts, (The cotton Blue army shirt is excellent in hot weather) leggings, canteens, and other accoutrements. QM shop for Blouses and pants. A proper Mills belt can be had at
www.ssfirearms.com Best price I've seen for the Wool shirt is at QM shop, but no wool shirt is cheap anymore.
the WW2 brown leggings are very close, only a "Stitch Counter" would fault them. Donlt get the olive ones.