When the elastic goes

The elastic is gone from by Sylvester and Tweety Bird pajamas. Yes, I have Sylvester and Tweety Bird pajamas. They're shorts, and they're green. They're still OK to sleep in, but if I try to walk around in them, they don't stay up. They slip down, down, down. That doesn't bother me too much. What bothers me is wondering where the elastic goes when it goes. Just wondering.