I really like this sweater and I have the pattern. The problem is the yarn it asks for is sort of expensive and hard to find, I can only find it on this specific website. How can I substitute this yarn for one that is similar?
You need to find something that has a similar gauge, and likely the fiber content too. Look at yarndex.com - find your yarn, then click on the gauge and there should be others that are classed with the same sts/inch.
Great question, I have the same dilemia, thanks for that info.