Oops, one other thing you can do.  After you get the pose you want, do the magnet trick.  Here is how its done (at least in Poser 5).

--Click on the dress, then on the top row  (File, Edit, Figure, Object, Display, Render, Animation, Window and the useless Help-click on Object  and then Create Magnet

You will get a big Honking red horseshoe consisting of the big red horseshoe, a shunt bar at the magnet's base and a weird circle outline.  All three are very important.

The circle is call the magnet zone, everything in that zone will be deformed is where you place it is extremely important, move it to the part of the dress that you want to move and adjust the x,y,z  adjustments to what you want moved and nothing else eg the front of the dress at the bra level where you want the front end moved and not the back.

Now that big red nasty horseshoe, click on that and with its dials adjust the y coordinates and you will see that portion of the dress move, you don't have to move it too far just a little off the shunt.

Now here is where the neat thing come in, this is the place that you get rid of the horseshoe, shunt and nasty circle that's cluttering up your scene--click on Spawn Morph Target and name updown.  Now click and that Nasty big red horseshoe and hit delete.

You will now have a new dial called updown-adjust the dial and you will see that dress portion go up and down--if  you don't have everything going down-simply delete the dial and start over making minor adjustments with both the nasty red horseshoe, circle or both to get the results you want.

Try it on conforming clothes, it should work on them too

Additionally, on your curvaceous cutie, should work on her too same procedure.  Jan