If you can fit in race-cut jerseys, try Hincapie's. I'm shorter (5'4") but I have noted that they are really longer in the back than other jerseys I own. BUT you have to fit your hips in there (there's an elastic at the waist). Definitely not for everybody, but it's certainly worth checking out their sizing chart.

I got the Velo Bella team jersey and I really love it.