I realize that this isn't Fashion Lounge...
...but Kari Byron's wardrobe on the present season of Mythbusters has included a distinctive cowl-necked, side-buttoned gray trenchcoat; it strikes me as a dashing garment that would lend itself to a number of retrofantastic looks.
(One commenter on Redheaded Goddess Forums, where I found the image, sneered that it looked like "a costume from a 80's sci-fi series"--but not everyone would regard that as a bad thing.)
Does anyone out there have any idea where she might have gotten it?
ETA: braisinhussy has identified the coat as All Saints' (unfortunately discontinued) Nahara Trenchcoat.