I love this idea of wearing cable knitted cowl into a chic sweater vest. Perfect for cold whether, wearing cowl outside and vest in room or office. There is a good shop on Etsy from Pilland, carrying this beautifulcable knitting cowl in different colors and pattern, you can head over if you are interested.
Meanwhile if you are a gifted knitter, you may have an idea on how to make it. Here is an video tutorial with similar knitting pattern that may get you inspired.