To pin the fabric directly on top of each other. Layer, usually 6 or 8 depending on pattern , making sure each piece is the same pattern. Pinning two pins are used at each location. Find a suitable easy to find point on top fabric. Push pin through all layers at exactly the same point. Pin is at right angles to fabric . Hold firm and take second pin and pin across other pin as close as possible. Do this about a fist apart. It seems a lot but it does help.