This coat is based on a Navy Officer's Bridge Coat. They are normally made of melton wool and not cashmere. You can find the melton ones on ebay and elsewhere for under $200. They are exceptionally warm coats and you can replace the brass buttons if you don't like them.
Zombie Post!Conan Doyle's Sherlock Holmes was awarded the Legion in "The Adventure of the Golden Pince-Nez" and the re-imagined BBC series has edged the lapel buttonhole on his overcoat with red thread in a manner similar to the way Legion recipients do.