I've only seen a handful of fishtail parkas that I think could work. I found this one through Mono magazine. Mono is a Japanese magazine, so all I know about this jacket is it costs 14,490 yen and it's called the M-51 field parka. That and if she notices the fishtail it means she was checking out your rear end. Check it out here.
I have a moonstone jacket. I really like it because it's extremely light and really packable. It's perfect in a lot of situations. You can wear it as a middle layer underneath a shell or on it's own. I always end up wearing mine way too deep into the winter. It's a great 'sprint to the car from your front door or you'll die of hypothermia' jacket. Get it at your favorite camping/outdoor store. I like REI.
Saved the best for last. The boys over at h(y)r pointed this Albam jacket out. The madras print is sweet-just make sure it's a slimmer fit-a baggy fit with a print like this could lead people to confuse you for a couch. I love the hood too. I never really pull my hoods up, but I think a good hood always adds to your silhouette. I also have a sneaking suspicion that your girl would add this to her steal from your closet list. Buy it here.