Quote Originally Posted by Samcaesar View Post
Well, it needs to be "tight"
Few misconceptions in this part but yes plate armor was designed to be form fitting as you have said.

But it's got to be loose enough to often fit a layer of chain mail:

Plate armor was not THAT tight.
Knights wore gambeson, or doublets under their armor, this was form-fitted quilted cloth armor designed to soak up the force of a blow, and prevent piercing weapons from penetrating too deep. Often it would be paired with 'MAIL' armor (chain mail is a misnomer) for added protection from piercing weapons.

Though you are right with it being ill fitted, the transfer of force will end up being devastating in some spots.

Plate armor was not designed around transfer of force (The Gambeson was actually designed to soak the force of weapon attacks.), it was designed to deflect and direct blows away from important areas of the body, the link you posted also states this. plate armor was then designed around the underarmor, and despite popular misconception it wasn't entirely thick or heavy