"About as well as you'd guess -- and I can wear a suit, Jones."

He drawls Ianto's surname deliberately, narrows his eyes at him before taking another sip of water and screwing the bottle closed.

"I've worn suits before. Just because you like them more doesn't mean I never wear them."

Admittedly, mostly for funerals and ceremonies but still. He's worn them. It's the principle of the thing, after all. He can be formal if he needs to be formal, he just prefers not to be if he can help it. He's had enough stiff formality in his life already.