I am worried about this point...

The base and projected items are of the same type.
Makes me believe that I can't change my pld valor pieces with cloth type armor. I wanted to put my Sipaphi shirt appearance on my valor body piece... Seems like I can't even do that. At least from how I understand that sentence. I wish they gave an example for that to make things clear.

At the moment I'm assuming only the following things to be possible.

Plate armor -> only plate armor (haubergeons, lancer armor, cuirass)
Robes -> only robes

Things that I assume can't happen

Plated armor -> monk shirts

Can a dev shine some light into this?