What to wear with my French cyclist jacket (Hartmann pattern)

The jacket is incredible and looks unworn!
Okay here are some ideas for high waisted trousers:
A. Find actual vintage 30s 40s or 50s trousers on Ebay
B. Simon James Catchart makes really nice reproductions, pricey but great cuts and materials
C. Get something made custom, Luxire are an economical option but it helps if you have specific measurements for them to work from so probably best reserved for when you have a bit more knowledge on vintage clothing.

 

Thank you, this one looks so beautiful!

 

Good call. Aero also do nice trousers; Darcy trousers are a nice mix of cheap (not too cheap) and fair quality.

Another thing I might consider would be a pair of plus fours from SJC or Spencer's Trousers, really clock that 40s cycling vibe.

 

French work trousers even up to the 80s from what I can see were quite high rise. The ones from the 60s onwards would have slightly tapered hems too.

Buzz Rickson's make a very sturdy pair of chinos, with wide, but not crazy hems.

SJC are not that high rise from experience. I'm very happy with their tops, but not so much with the lower end.

Darcy 1950s trousers might work well too, although I think they only make in cotton which will crumple more than wool.

 

This!