Type of Feat: class (given based on class levels)
Prerequisite: fighter
Specifics: Character gains +1 Armor Class bonus. This is granted automatically to fighters every 3 fighter class levels (Levels 3/6/9). It's effects stack.
Use: Automatic.
This feat does not actually require you to wear armor and is a flat +1 AC applied to the character no matter what equipment they are wearing.