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This is something I have not given a thought to. Buttons are small and actually really handy. They allow you to keep your clothes up and easy to take them off too. The trouble is if your button breaks or you lose it, keeping those pants up or that coat closed to keep you warm may be a problem.
We all should have a sewing kit in our bug out backs or at least fishing line so we can sew ripped clothes. If we have no spare buttons we can make our own from sticks. See how below.