You might want to check out the M1951 wool field trousers. Depending on size they can, in some cases, be found in as new condition. Also there are a number of surplus wool pants from other countries on the market. I also think L. L. Bean has both dress and outdoor wool pants.
You wouldn't be near Fort Polk?
To paraphase "Oddball" (Donald Sutlerland, "Kelly's Heros", 1970) "I only drive 'em, I don't know how to fix them."
1974 CJ5, 232 CID (3.8 l), 4-speed
with Trailer, Cargo, 1/4 Ton, 2 Wheel, M101 CDN 2
(1994 Land Rover Defender 90)