Here is another Shroom knit last week out of LB’s Wool Ease Chunky.
Having now knit this hat 3 times, each time using different yarns, in my opinion the LB Wool Ease Chunky is a close match to S&C Outer, however, I definitely agree with the designer when she suggested that there really aren’t a whole lot of yarn substitutions for Outer. I think mostly because Outer is a cotton/wool blend so the cotton offers more drape.