Constrained or choreographed groups work well ony if theirs vertex have distance from body polys equal to collision offset. It means that you can use them only with cloth made for particular figure. Another way constrained groups looks weird - strange peaks or holes.
If you want to use clothes from one figure to another you have 3 choices.

1. Add dummy props in crucial areas. You can use it either to obtain special effect. Props which crossing clothes can be use as a constrained groups changed during animation. For example you can "pin" sides of open shirt with cylinder prop (stick shape) to chest of the figure. If you make it invisible in some frame, at this moment you unzip button and open shirt.

2. Using cloth room fit it desired figure (see my tutorial steps 1-9 http://www.renderosity.com/mod/tutorial/index.php?tutorial_id=2154)
   Then import cloth which you fited for pose "0", select constrained or choreographed groups and calculate dynamic.

3. Edit cloth obj in modeling program. "Close" holes of collar and arm. Polygons which cross through body will hold cloth in correct place - some verts are "under skin" and cannot slide down.
   It can be done only with high res figures and clothing, calculation takes a lot of time, sometimes (in very dynamic animation) verts can be throw out from skin.