You are particularly good in a specific kind of armour.
Prerequisites: Proficiency with the armour
Benefit: Choose one specific piece of armour or protective gear. When you wear it, you get a +1 to both your Maximum Dexterity bonus and your armour penalty (i.e., a Max Dex +4 becomes +5, and an Equipment Penalty of -3 becomes -2).
Special: You can take this feat multiple times. Each time, it applies to a different type of armour. You can apply this feat to Power Armour.