It has a lot to do with their weapon and armor sections... particularly when it comes to evasion and how other "stats" are affected.
For instance, it is a fact that being "nude" in the each armor component (head, body, arms), is 10% evasion. The Cursed Ring at the top of the list is listed @ -10% evasion... it's actually 0%, but that's besides the point from the lack of understanding of that aspect.