Technically, they gain a penalty of zero. Since it has no noticeable effect though, you can treat it as if they gain no penalty.
No. There is no difference between being proficient and being nonproficient with 0 ACP armor.
Anyway, the only classes without light armor proficiency are monks and arcane casters -- who have other reasons for avoiding even light armor.
Also stuff like commoners can wear padded without having to worry about it, and little things like that
what is the penalty for what wearing armor your not proficient with? what page number.
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what is the penalty for what wearing armor your not proficient with? what page number.
That can be found here.
Emphasis mine:
Armor Check Penalty: Any armor heavier than leather, as well as any shield, hurts a character's ability to use Dexterity- and Strength-based skills. An armor check penalty applies to all Dexterity- and Strength-based skill checks. A character's encumbrance may also incur an armor check penalty.
Shields: If a character is wearing armor and using a shield, both armor check penalties apply.
Nonproficient with Armor Worn: A character who wears armor and/or uses a shield with which he is not proficient takes the armor's (and/or shield's) armor check penalty on attack rolls as well as on all Dexterity- and Strength-based ability and skill checks. The penalty for nonproficiency with armor stacks with the penalty for shields.
Sleeping in Armor: A character who sleeps in medium or heavy armor is automatically fatigued the next day. He takes a –2 penalty on Strength and Dexterity and can't charge or run. Sleeping in light armor does not cause fatigue.