Found better pants by going through the climbers’ pants sections of the larger BP stores. It was EMS, but that has since gone to REI. Found some pants made of soft shell material, very stretchy, light, and have both zipped and non-zipped pockets. Think they are called Marmot ‘Rock Star,’ or something like that.
They got their first test leaving a mountain top cabin when an unexpected ice storm lasted most of the night. The next day had to backpack down the icy mountain trail without foot traction, and loop back several miles over more even terrain to the trail head in the rain (It warmed up a bit at lower altitude when day came). While they were not totally WP, was comfortable packing all day in the cold, and used the pants thereafter. They also breathe well on hot days and pack up small in the pack.
So would suggest looking at pants used by mountain climbers.