I also did a Whisper Cardigan. I had to put the project aside for a bit as I somehow lost a skein of yarn. I had to order another skein and surprisingly the second skein that I ordered seemed to match!! I ordered the first set LAST YEAR!! I sure lucked out.
I used Alpaca Coproca by Coproca in Melange Blue. it is super soft and lovely.
I had to restart and cast on with less stitches because the sleeves were HUGE. If i remember correctly I think I cast on 76 stitches or maybe 80. I can't find my notebook where I had my notes. The sleeves still seem bigger than they should be but it looks ok. Overall I like the rest of the fit of the sweater alot.
This was my last project before xmas knitting. My last hurrah. :-)