Elias would probably wear eye-themed tie clips and cufflinks. Just a little thing for him and for the assistants to notice and hate as they become more aware of how they're trapped :)
“A tie clip, really?” Jon’s voice is scathing, balancing on the edge of disbelief. The small accessory sits proud and damning, nestled in the silk of Elias’s tie. It’s a tasteful piece, really, at least to Jon’s untrained eye, and he can’t tell whether that makes this mocking gesture any better.
Elias flashes him a smile. “It’s only appropriate to give a nod to our patrons, I think.”
Jon snorts. “Somehow I doubt the entity of voyeuristic terror you’ve decided to hand your entire life to cares about what you wear.”
“Mm, it’s the inner parts that matter,” Elias concedes. “Mine or yours, as it would turn out. Still, appearances are worth something, especially given the proclivities of our shared master.”
“Is that it?”
“I was also quite charmed by the irony of it. Wouldn’t you be?”
“I don't— Maybe, I think?” Jon forgets to be cutting, caught up in the absurdity of discussing ornamental eyes with his—evil boss. “The nuances of fashion have always eluded me, I admit.”
Elias hums. “It’s in the eye of the beholder, I suppose.” The joke startles a laugh out of Jon, incredulity tinging the sound.
“I— Really?” he brings himself to say. Elias simply smiles at him beatifically, like he didn’t say anything. Jon sighs, capitulating and hating himself for it. “I suppose I see the merits in hiding in plain sight.”
Elias’s answering grin is razor-sharp and quick.