Can I double yarn to make it thicker?
Yes, you may use two strands of a finer weight yarn held together to approximate the gauge of a thicker yarn.
Is it easier to crochet with thick or thin yarn?
Most people find that yarn, which is thicker than thread (see more sizing information below), is easier to work with than crochet thread. That said, there are certainly crocheters who’ve jumped right into working with crochet thread from the beginning.
What is thin yarn called?
Cobweb – a yarn so thin you’ll practically need a magnifying glass to use it.