Roy's costume is a pair of sunglasses that often comes off. I doubt it really matters whether he's in costume or not. Cassie isn't in costume, though admittedly, I don't read much of Cassie so I don't know how public she is when she's wearing a different outfit and hat and to be honest, would you really believe it was KD at Rockerfeller Centre? I'd probably just right it off as 'no way'. Bat!paranoia is very subjective - as much as they say 'never use names', the amount of times they do is insane. I might be over analysing too, but okay.