Here are some fun, cheap pants that are pelvic-pain friendly. They have a high elastic waist and are completely loose-fitting below that - no binding at the low belly, hips, or gusset. A simple navy top works well with the black and white pair:
The blue version needs a rich color on top to balance the intensity of the color and pattern:
I've also worn these with long form-fitting tops over the pants, to emphasize my curves. I'll see if I can get some photos of those looks up next week!