This pattern calls for two different weights of yarn to be used, held double while knitting. The two yarns that are required are

• Approximately 655 yards of worsted weight yarn, with a gauge of 18 stitches in 4 inches / 10cm.

• Approximately 655 yards of bulky weight yarn, with a gauge of 15 stitches in 4 inches / 10cm.

The pattern also includes information about how to size the sweater up and down according to your personal gauge and desired sweater size.