I really(x2) like my De Havilland pants! Compared to anything I've worn in the mid-weight category, they're the best thing going for design, features, and performance. [Also the lowest price by quite a bit.] Over the last 3 months I've worn them most nights of the week while snowshoeing/rucking.
They do make noise in the same way my Sitka Timberline pants make noise. When handled, both pants make a sound similar to a flag or tarp rustling in the wind. I do agree with others to not expect the sound to fade over time, and that a tighter/athletic fit will work better to minimize friction or bagginess.
Other:
>I would NEVER bow hunt in them. Why tolerate mild pant noise when 100% avoidable? Zero noise is an easy enough rule.
>Would probably not wear them coyote stalking unless breezy.
>Easy go-to pant for rifle hunting if breezy, climbing, or open country.
Another pant in the material weight category is FL Catalyst, but they have the same zipper front pocket thing going as Timberline pant. [Why do they do that?

] Catalyst are stealthy quiet, FWIW.
Hope this helps!