This is less a design than it is an idea. Have fun with it and be creative!
Size 13 needles
About 200 yards of aran to worsted weight mohair or mohair blend yarn (400 yards for mirror version)
I used Kidmo by Blue Moon Fiber Arts. Unfortunately this yarn has been discontinued, which is a shame because it is absolutely lovely. Kidmo is aran weight 90% mohair 10% nylon to give you an idea for what to look for in an appropriate substitution.
CO 60 stitches very loosely
Knit in stockinette stitch for ~20 rows.
Continue knitting in stockinette st, but start dropping stitches in random places in random rows. I dropped about one stitch on every right-side row for the first couple of feet of the shawl. After that I began dropping one stitch every 6 rows or so.
When you have 35 stitches left stop dropping stitches and work in stockinette until you run out of yarn or the shawl is as long as you would like.
You can bind off loosely now to create a shorter, asymmetrical shawl like the one pictured. Total length of mine is about four feet, and is long enough to wrap around my shoulders. The shawl is super light and the mohair "clings" to itself enough that no pin or clasp is needed.
If you want a larger shawl or if asymmetry makes you want to pull your hair out (I get it, I really do) a mirrored version is easy enough to create. Knit the first half as above but instead of binding off, place the shawl on a stitchholder. Knit the second half of the shawl the same way. Graft the two halves together using the kitchener stitch.