I have a top pattern with darts at the bust area. The dart placement does not fit. The darts are too high. I tried to lengthen them and shorten them but nothing worked. They still do not fit. They need to be moved. How do I do that? I have sewed for years but have always stayed away from things with darts because of the problems I have had with fitting them. Can any one tell me how to go about moveing the darts? They need to be moved down . Thanks in advance.