Alzrius
The EN World kitten
If you were making a female PC (and maybe a woman), would you choose:
Magic Bikini Armor = Padded Armor +2 (+4AC)
Elven Chain armor + (=5AC give or take, too lazy to look it up)
Bikini Plate Armor = partial plate (+2AC)
Studded Leather = (+3 AC)
With no magical bonuses, you're almost always likely to choose a full suit over a partial suit (sexy armor). If magic bonuses are involved, you'll still probably take the full suit in the wieght class you want with the magic bonus.
The issue I have here is that I don't agree with the premise you've set up. Even presuming that we go with the default assumption that those are the only items available to raise AC (which seems unlikely), you aren't taking into account all of the issues I raised in my previous post.
If one lowers her Dex so that her total Dex bonus plus AC bonus is less than what she'd get with a lighter armor that doesn't cap her Dexterity as much, she'd do with the latter armor. If she's a spellcaster, and one cuts down on her ability to cast spells (% failure chance) more than another (especially if she can cast defensive spells), she'll choose the lighter armor, etc.
The scenario you've crafted is right only within the context of itself, and doesn't match a lot of what I see at the game table.
EDIT: This is also drifting away with the original point I was raising about magic armor. Quite simply, if you tweak the premise so that the four choices are...
Magic Bikini Armor = Padded Armor +4 (+6AC)
Elven Chain armor + (=5AC give or take, too lazy to look it up)
Bikini Plate Armor = partial plate (+2AC)
Studded Leather = (+3 AC)
...then it proves your original point (about always going for the highest bonus) and mine (that such armor is the smarter choice, but this isn't conveyed in a still image) both.
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