I've never heard of it. Is it from a book? In order to help you we need to know the gauge and/or weight of the yarn suggested. If you have a link that would help, too.
Wait...is this it?
If that is correct then this is the yarn they recommend.
It's aran/worsted weight yarn that knits up at 4.5 sts over 1 in. Silk is a drapey yarn so to simulate that effect you'll want to use something that would provide drape. I don't know enough about different yarns to help, but hopefully this info will give someone else with more knowledge to do so.
Also..here's the website - http://www.macandme.net/index.html