First, let's add in this grumpy feathered general into the picture :P Sco- I mean Pyranite is really into more formal clothes out of her nest to show her status and the fact that she is "controlled and disciplined" and not like some stupid fireheads around the corner. But it doesn't really help if she just looks at everyone like they are potential enemy :P

And then~

Hecate Senpai lookie who's here, the pawn player! Or Celeste at a costume party :P

But other then that he usually wears militaristic/formal clothes unless he was forced otherwise

And holy scrap does he enjoy chess a bit too much

I mean, he is based on Ciel after all :P