Since no one has mentioned her, here is a prime example of a character design that's all about the looks.
The other party members in FF7 have outfits that make sense for their jobs (even if the characters themselves don't). Cloud's got a warrior's attire, Barret's makes sense for a gunner... Hell, even Cid's works for a dragoon.
But how does Tifa's teeny-tiny skirt and obnoxiously large boobs make sense for a monk? If anything, her boobs should be hitting people instead of her fist; at that size, they may just do more damage that way.