This is a beautiful step by step photo tutorial with easy to follow directions. The gauge for this arm knit cowl is dependent on the size of your arms, however generally the cowl fits 12” by 60” and loops twice around the neck.

This gorgeous oversized cowl plays with scale in such a fun and stylish way. it is quick as can be which makes it perfect for gifts. Apply the arm knitting techniques to so many fun projects.

Tutorial portion is free at website.
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Notes from book pattern:

A simple shift in scale can completely transform traditional knitting. Playing with yarn size and weight will result in a range of styles, from a lighter scarf perfect for the shoulder season to an impossibly cozy cowl for diving into in the depths of winter.

Materials:

Slim cowl: 348 yds (318 m) of ‘slim’ super-bulky yarn in four lengths of 87 yds (79.5 m) (traditionally 2.75 st per in; ex. Purl Soho Super Soft Merino)
Mid cowl: 270 yds (247 m) of ‘mid’ super-bulky yarn in three lengths of 90 yds (82 m) (traditionally 2.25-2.5 st per in; blue example in Madelinetosh ASAP)
Big cowl: 270 yds (247 m) of ‘big’ super-bulky yarn in three lengths of 90 yds (82 m) (traditionally 1.75-2 st per in; white example in Blue Sky Alpaca Bulky)