Follow pattern throughout.

Drawstring - instead of sewing the crochet ball to the chained drawstring, I:

1. crochet the ball, stuff it with a
   little pillow stuffing, close the gap with sl st
2. then continue to chain
3. when drawstring reach 80cm, thread it
   through bolero
4. then continue to crochet the other ball, stuff it
5. sl st to close gap, fasten off.