How do you fit an index card around your body?

How do you fit an index card around your body?
Fold the card in half. Cut from the bent side across, a centimetre to half an inch from the edge, stopping about the same distance from the other side. Now cut from that other side a similar distance from the previous cut and stopping early as before. Continue to cut across from alternating sides until you reach the end; the last cut must be from the folded side, not the edges. Now, unfold the card. You should able to expand it into a loop that is quite large. To change the length of the loop, simply alter the distance and/or number of cuts: more cuts with less between them (which makes a thinner band) means a longer loop, and the opposite is also true.