Lex is fat
Lex felt like he was meeting Geeves for the first time, and he quite liked it. Even if his prior meeting had not been extremely brief, how could Geeves show off his sadistic side in front of the Innkeeper? He had been on his best behavior. But now, in front of Leo, in his extremely sleep deprived state, Geeves has thoroughly lost all inhibition, and so let his true self show.
What Lex didn't realize was that his true self was not a sadist as he made it seem like, no. His true self was an artist, and he exhibited his art through his suits. The appearance of the suit was just the surface of the art. The functionality of the suit is what gave his art depth.
"I like the idea," confirmed Lex. "What are the limits of what you can do with the suit?"