The Savvy Sewer Salon at Sawyer Brook

What and where? Have made 2 for my husband. I opened up a couple of his old ones and I swear one of them has flannel interfacing!
ANY tips for me about tie making?
I do know the pattern must be cut on the bias.
Are there specific fabrics just for ties? Does it HAVE to be silk?
Are there different lengths?
What's hair canvas?
Thank you!!!