Waistcoat: 81-86cm 7 balls, 91-97cm 9 balls, 102-107cm 10 balls, 112-117cm 11 balls, 122-127cm 12 balls, 132-137cm 13 balls. Based on 25g balls 51% nylon, 25% wool, 24% acrylic DK. DK tension 22st/ 30 rows to 10cm, 4mm needles. Recommended yarn Sirdar Softspun DK (shown in shade 552). 3.25mm and 4mm needles.