Fabric used in this sample is from Amy Butler's Cameo Quilting Weight fabric line by Rowan.
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Pressing a crease on the folded edge (top edge).
Just to prove that a zigzag is just as good as a serger, I've done each sample above differently. The one on top is zigzagged and the bottom is serged. As long as those raw edges are overcast somehow, doesn't matter how you do it!
Top sample is squared off and bottom sample has been left flat.