Clothing for a figure is designed to work on that figure in it's out of the box unmorphed state.  So because of that when you add morphs and change the figure's shape, the clothing doesn't usually fit anymore.

svdl gave a link to his script that will help.

Also, here are some other options for other programs that can help fit clothing from one figure to another, or even from the same figure to one that has been "morphed up" using their morph packages.

The Tailor, which can be bought here:
http://www.daz3d.com/shop.php?op=itemdetails&item=677

Wardrobe Wizard (I use this one and it's great). It can be purchased from PhilC's site here:
http://www.philc.net/WardrobeWizard.htm

Clothes Converter, which can be bought here:
http://www.daz3d.com/shop.php?op=itemdetails&item=3069&cat=131

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi