These are known as The Cat Trousers, because the waistband, zipper fly and pockets are made out of cat fabric:
These are based on the same modified pattern as my blue and brown shorts. Changes include making them longer (duh!) and adding lining, made out of dark grey cotton. Overall, the trousers have a pleasently heavy feel. That’s not to say that they weight a lot, but that they have body and will be warm in winter, but not too warm to wear in spring either.
I’m really pleased with the finish on these and think they are quite cool looking, as well as being super comfy.