There is no "back" armor in skyrim. However some armors will include a cape, such as the Nightingale armor.
There is also a mod on the skyrim nexus called "cloaks of Skyrim" that will allow your character to wear a cloak or cape.
Capes, as far as I can tell, are available only for the people who went to the 2011 Minecon, and if you donate for the Optifine Mod. Other then that, there is a mod that allows you to have a cape, though some people may think that you are hacking.
As far as I know, you can only obtain cape-like armor through certain sets like the Nightingale armor you can get in the Thieves Guild mission line with Karliah.
The Capes ended in 2008.
The Capes was created in 2002.
you can download capes
Lee Capes was born in 1961.
Bernard Capes died in 1918.
Bernard Capes was born in 1854.
Lewis Capes was born in 1971.
The population of Preston Capes is 188.
Myriam Capes was born in 1984.
Geoff Capes is 6' 6".
Arthur Capes was born on 1875-02-26.
Arthur Capes died on 1945-02-26.