Originally Posted by Shandy

Hope I can explain this properly. Match up your seams by putting a pin right through both of the seams from top to bottom, once and leave it kinda dangling there....Then put a pin on either side of this, in the usual manner. By using that first pin and having it perpendicular to the fabric, you don't shift the seams by trying to put it down through the fabric. After you anchor with the two pins on either side of the one that's dangling there, you can remove that first pin and sew. It helps me.