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Decide on a closure type. Add snaps with a snap plier tool. Add buttons by making button holes and sewing buttons on the opposite side.
If you want the option of closing your vest, you'll need to decide how. Buttons and snaps are popular options and easy to add. Measure where you want your closures to go. You can eyeball the top and bottom closures and then measure and mark precisely where the middle closures should be. Ensure you have the positions marked evenly on both inside edges so that they line up. Follow the directions for your particular snap plier. First affix the stub to one side, and next the socket to the other. To make button holes by hand, sew two parallel satin stitches the length of the button and connect them at the top and bottom (these are called bar tacks). Place pins at either end of the hole, just along the bar tacks, and slice open the fabric in between the seams using a seam ripper or small, sharp scissors. Alternatively, your sewing machine might have an attachment for button holes. Lucky you! Sew buttons onto the opposite side of the button holes.