Supposedly only for the UK, but I was able to choose UK even tho I'm in Colorado and it worked fine. Also, they randomly give our male/female versions of the armor, so you may get a code for armor that isn't gender compatible. I was able to clear out my cache and try it again, got the right type on my 2nd try. I guess if you have spares as a result of not getting a gender appropriate one, you can always post them here for others.
Cool little deal, nice looking avatar outfit, especially for free.