I thought maybe that was the case. If you look in your project book, it should have a section about what kind of yarn is used with the gauge that would have been specified on the original yarn. With that, try the yarn switcher. I have a Pengouin pattern book that has the same thing. What I found yesterday, listed the yarn as "Susan Bates Patons Cotton Top". Also, Susan Bates products are made by Coats & Clark who make Patons, I believe.