I'm going to knit a sweater I found in Jamieson's Shetland Knitting Book 3. The yarn requirements call for Spindrift Yarn using three strands together. Jamieson has changed their skeins from ounces to grams. One color requires 12 skeins and I'm sure when this book was printed the skeins were in ounces. Does anyone know how I should convert to the new gram skeins. I have no idea how many yards/meters were in the old skeins. Thank you in advance for any help with this conversion.