Measure the area where you’d like to string your garland; then double the figure to allow for draping. Cut a piece of thread or floss to that length, adding 2 inches on each end for hanging.
Tie a large knot at one end, and thread a needle at the other end. Begin threading each button: Put your needle through the left hole, then come back out the right (to keep the buttons flat), until the garland reaches the length you want. Tie off the end with a large knot, and use small tacks or nails to hang your button garland.