I aborted an attempt to do a mobius scarf earlier this summer. It turned out I needed a much longer circular needle than the 36 in I had. I bought a 45 in needle and have now completed two mobius scarves using the pattern Long Mobius Cowl by Haley Waxberg . The blue one uses Cascade Yarns Pacific® Chunky yarn.
The black one uses Berroco Ultra® Alpaca Chunky