There's no organic way to set this up, so let's just jump right in. A gown-length infinity snood made of mohair now exists. It's unclear who would ever want or need it, but here we are.
Eastern European-based company Dukyana has hand-knit a design they're calling the Chunky Mohair Tube Scarf and it has gone viral because it is ridiculous. It's viral-ness means that it is currently almost sold out in most colors (except gray), but interested parties can still pre-order the out-of-stock options and they will supposedly be ready in about 10-14 days. Yay for you!
There is no practical purpose for this piece of clothing — it literally doesn't have arm holes — so you won't be able to do anything in it, except maybe watch TV. Also, do everyone a favor and try not to run, or walk down stairs in this scarf, as it is somewhat tight-looking around the legs, and since there are no arm holes, you won't be able to brace for a fall.