made a cowl from a pair of old velvet trousers my mum wanted to throw
away. I cut the trousers into stripes (just like making t-shirt yarn,
but with only about 1cm width, because the material is rather heavy),
tugged the stripes (very gently) and started knitting.
The cowl is knit diagonally.
I used 12mm needles, but thicker needles can be used as well.
Row 1: ssk k until last stitch kfb
Row 2: purl
Row 3: ssk k until last stitch kfb
Row 4: *knit yo* repeat
Row 5: ssk knit (dropping all yo's) until last stitch kfb
Row 6: ssk k until last stitch kfb
until you run out of material - ideally until the cowl would fit nicely
over your head. Then connect the ends by grafting or sewing.