@RobotDr Hello there!
I just wanted to weigh in on one of @REI-JenK‘s recommendations!
I love the REI Talusphere pant! I am a big girl and was looking for a waterproof pant last year to wear while skiing. I found this pant to be my solution! And while it isn’t full zip, I had no problems getting them on and off around bulky ski boots. In addition I love the stretch that these pants offer.
I hope one of these options work for you.