+1 for the
JP Ryan patterns. Also her husband is a big fellow, so the patterns do well with 21st century physiques.
Stophel did hit on a common problem... but it's to be expected. If you buy over-the-counter breeches or trousers... you will probably need to tailor them. He mentioned that breeches were tailored to the individual, and this is perfectly correct. It needs to be done today as well.
I have sewn both trousers and breeches, but had a tough time until I borrowed an actual pair of breeches, to help me put them together. I learned to sew with a pattern, after I got into this hobby.
AVOID
Eagle View patterns (imho).
Pegee of Williamsburg and
Kannik's Korner patterns will work (imho).
I use the directions for shirts from the book
Tidings of The Eighteenth Century by Beth Gilgun. (I shorten the length of the collar opening over the sternum.) It's also a good book to see what the pre-AWI styles were, what folks wore as basic clothing, and has basic information on hand sewing stitches used back in the era. You should get the book and read it for that information.
Some folks hand sew everthing. Some machine sew. Others machine sew all but the stitchin that will be seen by the eye when the garment is worn, and stitch by hand those seams.
Here are some sources for wool. It's not cheap, but it lasts under hard use. Most folks when using such expensive fabric, take a pattern, and using super cheap cotton/polyester fabric from Walmart,
they make a test garment to check the fit on the wearer. They can then see where to adjust the pattern, so when the wool is cut and sewn... it fits well, and has not resulted in a costly disaster.
Wool:
Military Heritage
Wm Booth Draper Look around on the site for various priced wool
MJ Cahn
B. Black & Sons
Canvas if you need it might come from:
Big Duck Canvas.
And you had the link for Fabrics-Store for linen.
LD