Dear Ryan,
There's a German costuming group which portrays the Ithilien rangers
of Peter Jackson's "Lord of the Rings" trilogy. They have a website
and a forum, too. The different parts of an general Dunadan ranger
costume are descriped there very precisely: http://dunedain-germany.de/

Unfortunately, the site and forum are in German. But as being member of
this group and having an account at cosplay.com to present my
costumes, I've written a description of my Dunadan ranger costume in
English: http://www.cosplay.com/costume/178744/

I hope that this helps you to create your ranger costume. Christmassy
greetings from Germany!
Mohmoh