Crochet a generous length of chain and when you feel it is long enough, double crochet into the second chain from the end and continue working a double crochet in each chain to your beginning chain.
Tug the tie to ensure that it is firm and even and use to decorate your parcel and amaze your family and friends.
P.S. A quick reminder of how to work double crochet (dc). Insert hook in chain (ch), wool round hook (wrh), pull through chain (ch). You now have two loops on your hook. Wool round hook (wrh) Pull through both loops. You know how to work a double crochet stitch.