If you are going to double the yarn, you need double the yardage.woolerymammoth said:I forgot earlier that your pattern calls for a 3-dk yarn. In order to use your yarn with a pattern for dk weight, you can use your yarn double stranded and get the same result as using a dk weight yarn. So using your pattern and your fingering weight yarn doubled should work just fine. You still need about 100g of yarn to make an adult pair of socks.