Quote Originally Posted by zergling.exe View Post
A 415

Knowing what feat exactly this is would assist in helping to determine requirements. In absence of knowing what feat you are talking about I will use Exotic Armor Proficiency, from Races of Stone.

This means that in order to take the feat you have to be proficient in the armor category already.
Wouldn't help one bit. The only text we have is what I've posted. Sorry.
Thanks for the precedent though. Suspected that would be the case when as I was typing my question the answer was staring me right in the face.