SSE,.... Fer "make'n stuff", the main thing to remember is,... "KEEP IT SIMPLE"!!
You can git "sketch-books" from TOTW (fer $5.00 @), illustrated by James Hanson. These "sketchs" were done of articles in the Museum of the Fur Trade at Chadron NE.
Anuther good Sketch book" is the one done by Rex A. Norman, of Alfred Jacob Miller's paint'ns of 1837. ($7.50)
Fer start'n out, I'd suggest Moscow Hide and Fur (Moscow ID) as a source for commercial-tanned buckskin and fur. Always "wet" commercial tanned buckskin and STRECH it good, 'fore make'n clothing (or, it'll "grow" bigger as you wear it)!!
Brain-tan buckskin is tha "best", but very expensive, so it's usually better to practice make'n cloths with the commercial hides at $2.50 sq. ft. 'fore cut'n on the $15.00 sq. ft. stuff!
Cloths made out'a commercial hides will last a feller for years, but doesn't "breath" like brain-tan.
MH&F doesn't sell brain-tan, but ther "smoke-tan" looks 'bout tha same at a fraction of the price. If you use commercial-tan, make yore cloths with the "shiney-side in" and the rough-side out 'cause it looks more like the "real stuff" thet'a way!
"Hamilton Dry Goods" in TN, handles all sorts of material such as linen, wool, muslin, and etc., for make'n shirts'n stuff.
WalMart sells canvas, if ya want to try make'n yore own tent, lean-to, "fly", ground-cloth'n such!!
If ya stay away from "fancy stich'n" and "bead-work",... ya cain't hardly go wrong, 'cause the average "trapper" didn't make the fancy stuff,.... bead-work was "wimmin's-work"!! ::