What is Double Knit Yarn?

Double Knit Yarn (or DK) simply means it is a double thickness yarn. Very often it is considered to be twice the thickness of sock yarn. In days gone by, knitters would use sock yarn, held in double, to make a thicker garment, which is where the name double knit wool comes from. In Australia 8 Ply wool is usually also referred to as double knit yarn.