What is it that makes sense to you about swapping out plate armor for a wizard's robes?
And why rob yourself of the experience of totally biffing your build because you really like the look of those greaves. I know whatever type of Jedi I play in KotOR, they're going to walk around looking like the left hand of darkness.
It's worse for Baldur's Gate because the items have more character than most games. The armors can have names and backstories of their own, just casting that aside doesn't seem cricket.