A pattern for a crochet bolero done in Patons 100% Cotton DK. Needles: 3.50mm (UK9) crochet hook. Number of 100g balls required: Chest size 32 inches: 5 balls. Chest size 34 to 36 inches: 6 balls. Chest size 38 to 40 inches: 7 balls. Chest size 42 inches: 8 balls. Photograph shade of Cotton DK: 2731.