Don't go the CostumeBase route unless you really don't care too much about accuracy. I have one that I bought out of desperation. Yes, it's cheap, but it is Halloween costume quality, really.
The collar is not only unstructured, it is inaccurate - it doesn't extend as far as the front placket they way it should. The pockets themselves are reasonably accurate, but there is velcro on all of the pocket flaps, stitched through to the outside so you can see it. As Risu mentioned, it is unlined, and the fabric is a bit thin - it wrinkles more than it should. The basic pattern and color overall is not bad, but the sleeves are weird - they are SO long! I am 6' 2", and had to take them up almost two inches!! I guess their model was a gorilla.
Dawn Andersen made the nicest, most accurate jacket - doesn't look like she still sells them (they were nearly $500). She does still sell the pattern for $18, though.
Good luck with your search. Share your findings!
Rick