Issue Nr. 4/2015 of the Handmade Kultur Magazine includes instructions and a pattern for a "hoodie-scarf". As they say in the magazine: it doesn't matter whether it is a hoodie or a scarf as long as we look good wearing it and as long as it keeps us warm. I totally agree and decided to sew one myself.
The pattern is very easy and the instructions in the magazine very detailed (German only). In terms of fabric you can basically choose whatever you want. I recommend to use thick/warm fabric however. Depending on what fabric and color(s) you choose the "hoodie-scarf" looks quite different.
I decided to use wool fabric (merino) which is very soft and warm. I can't stand itchy wool/fabric particularly for a hat or scarf. Furthermore, I used the same fabric and color for both "sides" of the "hoodie-scarf". I would have preferred to use two different colours or fabric, but couldn't find anything that matched. Nevertheless I am very happy with the result. The "hoodie-scarf" is very soft, warm and looks great!
The "hoodie-scarf" is also a great gift. I sewed two more as a gift for my mom and sister.