There are several Python scripts by Dimension3d in the free section area:
http://www.renderosity.com/mod/freestuff/index.php?user_id=288865

The one you need is called "Delete" ;)

I strongly recommend you "Conform" to conform several clothing pieces to a specified figure !

These Python scripts are just excellent , a really "must have" - and they are free !

If you need some help on how to use Python scripts , just ask ;)

Alice's and GND4's Tailor !
Check my free clothing fits : www.alizea3d.com