I have managed to finish two of these jackets done on my 28 inch square loom in the last several months. They don't take too long to weave, they are then felted in the washer and sewn. Then I add a crocheted cuffs and a hood. They all come out about the same size but no matter. They are sent to Lifting Hand International for refugee relief, link here to the Ravelry group Hats and More for Refugees Worldwide. Here is a link to the original instructions:
http://spinsjal.blogspot.com/search/label/Square%20Loom%20Weaving