I was just looking at the Construct modification rules and there is a way to change a Construct into a suit of armor. A Necromancer could make the Flesh Golem negative energy variant and change it into Construct armor. The party fights this big hulking Necromancer. Then, when they think they have him beaten, the Flesh Golem disassembles itself and reassembles next to the unharmed medium sized Necromancer. Of course, once the party gets over the fact that the Necromancer was wearing a bunch of dead bodies stitched together, they will probably hate you for making you fight the same enemy twice in a row. Though, the Necromancer might need to be a Cleric because I can't tell if Construct armor always has arcane spell failure or if it gains it if the armor dies while you're wearing it.
OH,BRILLIANT IDEA. The Necromancer wears the Flesh Golem whenever it confronts the PCs. Thus, they think the enemy is a hideous monstrosity. Then, the Necromancer takes off the Flesh Golem and the party meets him as a local noble or something like that. They would never equate the hideous large sized Necromancer with the attractive medium sized noble/friendly wizard/whatever else you want to work with.
EDIT: Wait, same size required... Well, you're the GM so you're always right. Just don't let the party look at the requirements for construct armor.
