I had the same problem.  I posted about it and got some really good tips.  My problem ended up being a cloth density issue.

http://market.renderosity.com/mod/forumpro/showthread.php?message_id=2444578

Also, here is a thread that has cloth room bookmarks.  Lots of helpful information in there about all kinds of things.

http://market.renderosity.com/mod/forumpro/showthread.php?thread_id=2739159

"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