5. In selction menu choose "show all". Export mest as an obj. If you click on dark square next to "export" you can choose export option. Check if UV is selected. As I remember wings default setting export obj without UV map. When obj is exported you can close wings.

In Poser skipping loading figure and importing obj I explain cloth room setting.

Selecting constrained group add materials constr, belt and belt trim (you did not add belt trim and you have weird wire on Victoria stomach.

Soft decorated add overskirt.

Rest is default.

Just now Poser finished simulation which was started about 2 minutes before first post of this tutorial was sent. I should delete more edges (step 3.2)