I have provided an exploded view of all the pieces (the thing I missed most from my commercial patterns), but there is no actual pattern here. This Instructable does not follow the process of either commercial pattern I had access to, it doesn't cover all ranks but is for the man's jacket for the rank of captain and below, and finally it doesn't cover sewing basics (cutting, grain, marking, pressing, basting, etc) so don't presume it will cover all the sewing skills needed if you have never touched needle and thread. So really, this is just my collection of OCD notes, if you find it useful, enjoy.
Aside from a basic pattern, I highly recommend the following websites for costume references:
And if you only get one sewing book for this project make it the Easy Guide to Sewing Jackets by Cecelia Podolak from Taunton Press. Of the many references I used researching how to make a jacket, this was the most comprehensive, best illustrated and well laid out.