What you'll need:
Cut three lengths of the different colours (three colours) of cotton cord.
Using the box clasp pinch the nine strands together.
Link the lobster clasp and chain together.
Start plaiting the strands together and loop each of cords through one of the chain links.
Once you have plaited the cords all the way through pinch together using a box clasp.
Add a lobster claps to the last link in the chain and your bracelet is done, as easy as that.