Here are a couple of things to try:
1. press well using starch
2. use the double pins (they look sort of like the letter U with a squared bottom...you put them in and both seam allowances are caught) I think Clover calls them fork pins
3. take a seam ripper and release 1 or 2 stitches and the seam allowance will spring back to where it's supposed to be
4. keep a seam ripper by the sewing machine; try to sew so that the seams on the underside are pointing toward you and the seams on the top are pointing away from you. If you can't do this, as the seams approach the needle, use the ripper to guide the underside in the the right direction.
5. piece with your walking foot if there are other seams that get sewn over
6. if all else fails, just press the seam allowance hard with the iron and/or snip the offending seam if it looks lumpy on the front!
Last edited by Gabrielle's Mimi; 04-27-2012 at 08:42 AM.