Create a cord

To make a cord, cut threads at least 3 times the length you want the cord to be.
Tie one end of the threads together.
Hang the knotted end from a fixed point -a door handle for example- and slide a needle through the loop at the other end.
Pull back to tighten the threads and twist them very tightly while rotating the needle.
Then fold the twisted rope in half, pulling it taut.
Untie the end, knot it securely and let the cord twist on itself.