Question: what is the difference between aran and worsted weight yarn?
Answer: Aran is more of a heavy worsted; it's slight thicker, getting a stitch or two less per 4" than worsted. They're usually fairly interchangeable in patterns though - just watch the gauge if it's a sweater. ... Aran is more of a heavy worsted; it's slight thicker, getting a stitch or two less per 4" than worsted.