Zig zag stitching on the sewing machine is my preferred option now. I have a serger which I inherited but haven't taken the time to learn how to use yet!!
I used to use masking tape but that can fray the edges when you take it off.
If you don't have a sewing machine then you could use blanket stitching on the edges to hold it together. It takes time but gives you peace of mind that your piece of fabric won't disintegrate while you are stitching!!!
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