I just finished this scarf today. I bought the wool and silk hanky from Lori Flood at SAFF (Southeast Animal Fiber Festival). She has instructions on using silk hankies in your felting on her website. She has wonderful dyed wool bats and roving. www.spinstertreadle.com
For this scarf, I used a bat and some silk hanky. I have never used bat for a scarf before and it turned out slightly uneven in places - just another thing to work on.