Strange collisions on cloth sim

I’m attempting to do a cloth sim to drape a skirt, and I’m having an issue where part of the skirt is staying in-place when the underlying object is set to collide.

I’ve tried changing various distance settings, but nothing seems to work.

(Sorry, had to split zip rather than compress within blender)
Dress1.7z.001 (5 MB)Dress1.7z.002 (490.7 KB)