[Klaus wasn't aware that spells required slots, but then he's not a wizard. He's not even a proper necromancer - he can just make ghosts, maybe even just one ghost, solid for a short time. Actual spells are beyond him.

He's intrigued by the idea of this clothing illusion, though, so he gives the matter some actual pondering.]

So it could be anything? Can you even add facial hair? I wouldn't mind seeing myself with one of those big fancy twirly mustaches.

[He mimics the quintessential villain mustache twirl with one hand.]