Belstaff makes textile lady's pants that are "fuller" in the hip area, and Vanson will do custom textiles. Both are double the price of 1st Gear, Fieldsheer, and Joe Rocket. I suspect I'll end up ordering a set form one of them, and having them altered. (The only place in this city that will work on waterproof clothing is a TENT manufacturer, if my wife finds out I had work done there, she'll kill me.)
If she rode her own bike I'd consider the Vanson, but she's only on the bike a few times a year.