Thank you! The loin at the link is too wide and big for my purposes unfortunately.
With Dreamwalker I made all things invisible I didn't want, but the slip that goes "round the butt" I can't because it belongs to the "rest".
As I wrote before I have no experience with changing clothes in Poser, so I don't know what a trans map is.  Can you please explain?
Sounds like you can make parts separate? Of course, this would be a great help!