Actually, just found a fourth possible one.
<!-- Clothing -->
id="fine_cloth_unarmoured"
loot_drop_score="10"
(Should probably be 5. Looks like a copy/paste error. Every other max quality armor tier has 5 as the
loot_drop_score, and 10 for the second best improved quality (for cloth it is
id="tailored_cloth_unarmoured",
loot_drop_score="10"). Since both are set at 10, that means the best and second best cloth armors are equally likely to drop for cloth, which is probably unintended.)