Mohair doesn't "tink" easily and the instructions aren't lengthy. So, it's disappointing to find two show-stopping pattern errors.
1) The stitch count is [11 stitches x repeat] plus 6 stitches. So, you need to cast on 138 stitches for the wrap.
2) Rows 1 is a purl row and row 2 is a knit row. The instructions following the knit cable row say to repeat rows 1 & 2 n times and knit the cable row again. What you really need to do is make the row prior to the knit cable row a purl row.
Make the above adjustments and the finished product will be light as air and beautiful!