[ He shifts back just far enough to get out of the shirt, caring little about getting half-naked in semi-public. When it comes down to it, what's the big deal? ]
You look better without. [ But fair enough, Ianto does wear a suit damn well. The way it hugs his ass? Delicious. How about he abandons the undressing for a moment to appreciate the suit? Possibly by sliding his hands down Ianto's back, eventually tugging him off the barstool so he can properly grab his ass? ]