First, start out by center aligning the piece of elastic on the spot of the fabric you want the elastic. Put a pin in the center of the elastic. |
You can now let go of the 'stretch' for a moment. You can see how much gather the fabric is going to happen. |
Arrange your hands again to stretch the elastic until the fabric is flat (no gathering). |
With the zig zag stitch, continue sewing the elastic until you get to the pin. |
You can let go of that first half of the elastic. Pull the pin out. |