The pants are the CarlaC Easy Fit pants. I added the elastic to the pant hems, but otherwise it is as drafted.
The store owner was SO helpful and I highly recommend this store. She also supplied me with the right colour zips and was very helpful with colour matching the fabrics.
This jacket feel very substantial and the owner of the fabric store was very confident that this combination (with a sweater underneath) will take her to about -10C (14F). Colder than that and she can wear her Land’s End parka and bib snowpants.